What is new in Tablelist 7.4.1?
-------------------------------

1. Optimization: The "-window" cell configuration option no longer
   performs a window update if the new option value equals the old one
   (thanks to Nicolas Bats for his proposal).

2. Eliminated a negative side effect of the optimization of
   "cellconfigure -image|text" introduced in Tablelist 7.4, related to
   interactive cell editing (thanks to Nicolas Bats and Alexandru
   Dadalau for their bug reports).

What was new in Tablelist 7.4?
------------------------------

1. Made sure that the Migration Tool for Tcl 9 by Ashok Nadkarni won't
   output any warnings or notes (thanks to Andreas Kupries for his
   valuable input).

2. Optimization: The "-text" option at row and cell levels, as well as
   the "-image" cell configuration option no longer perform a text/image
   update if the new option value equals the old one.

3. Made the drop target indicator and the gaps displayed by the "move"
   and "movecolumn" subcommands scaling-aware.

4. Made the default value of the "-targetcolor" option in Tablelist_tile
   theme-specific.

5. Improvements in the themepatch package, especially regarding the
   "default" theme.

6. The demo scripts "dirViewer.tcl" and "dirViewer_tile.tcl" now also
   demonstrate how the virtual event <<TablelistYViewChanged>> can be
   used to embed images into the items contained in the current view.

7. Eliminated a potential error message caused by the handling of
   <TouchpadScroll> events (thanks to Paul Obermeier for his bug
   report).

8. Several further improvements and minor bug fixes.

What was new in Tablelist 7.3?
------------------------------

1. Added the virtual events <<TablelistXViewChanged>> and
   <<TablelistYViewChanged>>, generated when the horizontal/vertical
   view in the tablelist widget's window changes.

2. Significantly improved the performance of "cellconfigure ... -text"
   (thanks to Paul Obermeier for his valuable contribution).

3. Guarded against the case that an embedded image was deleted (thanks
   to Paul Obermeier for his proposal).

4. Made sure that the handling of the <TouchpadScroll> event won't
   pollute the global namespace (thanks to Rolf Ade for drawing my
   attention to this issue).

5. Adapted the handling of the <FocusIn> and <FocusOut> events to recent
   changes made in Tk related to these events and the detail field
   "NotifyInferior".

6. Restored the support for Tcl/Tk 8.4, which was broken due to the use
   of package version numbers with a trailing "-" and of a submodifier
   in text widget indices (thanks to Samuel Brown for his bug report).

7. Fixed a long-standing bug related to the optimization of item
   insertion.

What was new in Tablelist 7.2?
------------------------------

1. Added the virtual event <<TablelistCopyFinished>>, generated by the
   default bindings for the key sequences that terminate the editing
   with an automatic postprocessing, when the copying of the new cell
   value to some other cells of the column is finished.

2. Added the "-aftercopycommand" configuration option, specifying a Tcl
   command to be invoked when after terminating the editing with an
   automatic postprocessing, the copying of the new cell value to some
   other cells of the column is finished.

3. Added the "-allowduplicates" column configuration option, specifying
   whether the interactive cell editing is allowed to set the text of a
   cell within the column to the text of some other cell of the column.

4. The demo scripts "bwidget*.tcl", "iwidgets*.tcl", "miscWidgets*.tcl",
   and "tileWidgets.tcl" now also demonstrate how to use the new
   "-aftercopycommand" and "-allowduplicates" options.

5. On Mac OS X/11+ Aqua the termination of the editing with subsequent
   "fill all" action is no longer bound to the <Command-a> event (which
   for most widgets on the Mac stands for "select all"), but to
   <Control-Command-a> (POTENTIAL INCOMPATIBILITY!).

6. Improved the performance of the photo image creation in the Tablelist
   and themepatch code as well as in the demo scripts, by explicitly
   specifying the "-format" option.

7. Adapted the scaleutil package to the recent improvements in the
   "classic" theme by Emiliano Gavilan.

8. Adapted the default value of the "-selectborderwidth" option in
   Tablelist_tile to recent changes in the "default" and "classic"
   themes.

9. Eliminated the temporary hang-ups experienced sporadically during
   scrolling in the presence of many embedded images (including tree
   indentations) or multi-line cells (thanks to Laszlo Zoltan for his
   bug report).

What was new in Tablelist 7.1?
------------------------------

1. Added support for terminating the editing with one of the following
   automatic postprocessings: (1) fill the column's selected cells;
   (2) fill all cells of the column; (3) fill down within the column;
   (4) fill up within the column (thanks to Blair J Basom for his
   proposal).

2. The multi-line cell texts are now displayed vertically centered
   within their rows, just like the single-line ones (thanks to Harald
   Oehlmann for his proposal).

3. Fixed a long-standing bug due to which under some circumstances the
   default values of several configuration options became theme-specific
   even if the tablelist package rather than tablelist_tile was being
   used.

4. Fixed a long-standing bug related to creating the expand/collapse
   control images when handling the "-treestyle" option (thanks to
   Nicolas Bats for his bug report).

5. Guarded against destroying a tablelist widget (e.g, by an "after"
   callback) in which an interactive column resize or row/column move
   operation is in progress (thanks to Ulrich Seidl for his bug report).

6. Handled the extremely rare case that the frame widget to be used as
   parent of the edit window already exists (again, thanks to Ulrich
   Seidl for his bug report).

7. Fixed a typo in the mega-widget utility file mwutil.tcl, introduced
   in the previous release (thanks to Harald Oehlmann for his bug
   report).

What was new in Tablelist 7.0?
------------------------------

1. Dropped the support for Tk versions earlier than 8.4.  This has made
   the code simpler and easier to maintain.

2. For the selection type "cell", the F2 key now starts the interactive
   editing of the active element, just like Return and KP_Enter (thanks
   to Alexandru Dadalau for his proposal).

3. Added explicit support for the themes "black", "breeze",
   "breeze-dark", "sun-valley-light", and "sun-valley-dark".

4. Improved the compatibility with Tcl 9 and Tk 8.7/9.  For example,
   added support for the new <TouchpadScroll> event, introduced in Tk
   8.7 and 9.

5. Removed the now redundant distribution file "repair.tcl".

6. Fixed a long-standing bug related to updating the list variable by
   the "insertcolumns", "insertcolumnlist", and "deletecolumns"
   subcommands (thanks to Alexandru Dadalau for his bug report).

What was new in Tablelist 6.22?
-------------------------------

1.  If SVG is supported, i.e., if the Tk version is at least 8.7 or the
    tksvg package can be loaded into the interpreter, then the new
    variable "tablelist::svgfmt" is set to a Tcl list that you can pass
    to the commands that create or manipulate SVG images as the value of
    their "-format" option to make sure that your images will be
    properly scaled (see the new section "More on tablelist::svgfmt" in
    Tablelist Programmer's Guide for details).

2.  In the presence of SVG support, added the arrow style "photo0x0",
    whose sort arrows are SVG images that will scale automatically
    according to the display's real scaling percentage (which can be
    greater than 200, the maximum value of the variable
    "tablelist::scalingpct").

3.  Removed the very rarely needed arrow styles "flat6x4", "flat7x5",
    "flat9x6", "flatAngle9x7", and "flatAngle10x7", and added the styles
    "flat10x5", "flat12x6", "flat14x7", and "flat16x8".

4.  The default value of the "-arrowstyle" option on X11 is now
    "photo0x0" if SVG is supported, and (depending on the display's
    scaling level) one of "flat8x4", "flat10x5", "flat12x6", "flat14x7",
    or "flat16x8" otherwise (POTENTIAL INCOMPATIBILITY!).

5.  In the presence of SVG support, added the tree styles "plain",
    "bicolor", "white", and "classic", which are quite similar to the
    styles "plain*", "bicolor*", "white*", and "classic*", except that
    they use SVG images whose sizes are automatically adapted to the
    display's real scaling percentage.

6.  The BWidget SpinBox and ComboBox widgets used for interactive cell
    editing are now scaled according to the display's real scaling
    percentage rather than to the value of the variable
    "tablelist::scalingpct".

7.  If SVG is supported then the temporarily or persistently embedded
    checkbuttons as well as the calendar and watch icons of the Iwidgets
    dateentry and timeentry widgets used for interactive cell editing
    now use SVG images that will scale automatically according to the
    display's real scaling percentage.

8.  For Tcl versions 8.4 and later replaced the deprecated "trace
    variable" and "trace vdelete" invocations with "trace add variable"
    and "trace remove variable", respectively.

9.  Improvements in the themepatch package, especially regarding the
    "default" theme.

10. In the presence of SVG support, the demo scripts now use SVG images
    created with the aid of the variable "tablelist::svgfmt", and on X11
    the demo scripts "browseTree(_tile).tcl" and "dirViewer(_tile).tcl"
    now set the "-treestyle" option to the SVG-based style "bicolor".

11. Guarded against destroying a tablelist widget in which interactive
    cell editing is in progress (thanks to Alexandru Dadalau for his bug
    report).

12. Several further improvements and minor bug fixes.

What was new in Tablelist 6.21?
-------------------------------

1.  For the built-in themes "alt", "clam", "classic", and "default", the
    "-stripebackground" option now has a nonempty theme-specific default
    value (for the "aqua" theme this has always been the case).

2.  In disabled state, the "finishediting" subcommand now returns
    immediately, without terminating the interactive cell editing
    (thanks to Ulrich Seidl for his proposal).

3.  Improvements related to the appearance of the Tk core checkbutton
    widgets embedded into a header label or a cell (temporarily or
    persistently).

4.  The (ttk::)checkbutton embedded into the header label of the column
    "available" of the tablelist widget created by the demo-scripts for
    interactive cell editing now appears in tri-state mode and is
    selected/deselected or set into the tri-state mode whenever the
    editing changes the value of any cell contained in this column.

5.  The scaleutil package now scales more styling options of the
    ttk::treeview widget and some styling options of a series of widgets
    of the "winnative" theme, too.

6.  The scaleutil package now supports also the case that on Xfce the
    DPI value was set in the "Fonts" tab of the "Appearance" dialog or
    (on Linux Lite 5+) via the "HiDPI Settings" dialog, or on MATE it
    was set via the "Font Rendering Details" dialog.

7.  The scaleutil package now takes into account that current MATE
    versions scale the font DPI for HiDPI displays.

8.  The Tablelist distribution now includes the themepatch package,
    whose "themepatch::patch" command significantly improves the look
    and behavior of the ttk::checkbutton and ttk::radiobutton widgets of
    the "alt", "clam", and "default" themes, and makes the "clam"
    theme's ttk::button and ttk::menubutton widgets as well as its
    ttk::treeview and tablelist headers smaller.  If the tk version is
    at least 8.7 or the tksvg extension can be loaded into the
    interpreter, then the package uses fully scaling-aware SVG images
    for drawing the indicators of the patched ttk::checkbutton and
    ttk::radiobutton widgets.  The demo script "tileWidgets.tcl" now
    patches the "default" theme on X11 via "themepatch::patch default".

9.  Added support for the case that the "alt" theme was modified by
    invoking the "themepatch::patch" command of the themepatch package.

10. Extended the description of the "tablelist::setThemeDefaults"
    command by the hint that with current Tablelist_tile versions there
    is no need for invocations of this procedure in application code,
    and this is now reflected by the demo scripts, too.

11. Fixed two bugs related to the "embedcheckbutton(s)",
    "embedttkcheckbutton(s)", "header embedcheckbutton(s)", and
    "header embedttkcheckbutton(s)" subcommands (thanks to Adrian
    Medrano Calvo for his bug report).

12. Fixed a few bugs related to the comparison of package versions.

13. Several further improvements and minor bug fixes.

What was new in Tablelist 6.20?
-------------------------------

1. Added the "dumptostring" and "loadfromstring" subcommands, which
   complement "dumptofile" and "loadfromfile", respectively (thanks
   to Rolf Ade for his proposal).

2. The argument of the "tablelist::getTablelistColumn" command now may
   also be the path name of a Tk core or tile checkbutton embedded into
   a header label.

3. Added support for the case that the "default" theme was modified by
   invoking the "themepatch::patch" command of the themepatch package,
   which is bundled with the Scrollutil distribution.

4. Redisplaying a column (due to, e.g., setting its "-align", "-font",
   "-formatcommand", or "-width" option) is no longer suppressed if the
   column is hidden.  This makes sure that on unhiding the column, its
   elements will appear properly formatted (thanks to Alexandru Dadalau
   for his example script that determined me to make this improvement).

5. Improvements related to moving a column interactively, especially on
   Mac OS X/11+.

6. Several further improvements and minor bug fixes.

What was new in Tablelist 6.19?
-------------------------------

1. The "get", "getcells", "getformatted", "getformattedcells",
   "getfullkeys", and "getkeys" subcommands now accept an optional
   argument with the possible values "-all", "-nonhidden", and
   "-viewable", just like the "curcellselection" and "curselection"
   subcommands (thanks to Alexandru Dadalau for his proposal).

2. If the tablelist widget has no columns then the "deletecolumns"
   subcommand now returns immediately without any further action, like
   checking the validity of the column indices (thanks to Paul Obermeier
   for his proposal).

3. Made sure that the workaround for the problem that in Tk 8.6.11 and
   later on Mac OS X/11+ the idle callbacks are often fired at
   unexpected times won't lead to invocations of callbacks for already
   destroyed tablelist widgets (thanks to Paul Obermeier for his bug
   report).

4. Fixed a bug related to making a hidden column visible again, which
   caused unexpected behavior when moving a column interactively (thanks
   to Ulrich Seidl for his bug report).

5. Made the detection of the desktop environment when calculating the
   scaling percentage corresponding to the display's DPI scaling level
   on X11 more reliable (thanks to Florian Pigorsch for his bug report).

What was new in Tablelist 6.18?
-------------------------------

1. Improvements in the scaleutil package, related to setting the default
   height of the ttk::treeview rows to a value based on the font's
   metrics (see the section "More on tablelist::scalingpct" in Tablelist
   Programmer's Guide for details); several extensions.

2. Added support for the case that the "clam" theme was modified by
   invoking the "clampatch::patchClamTheme" command of the clampatch
   package, which is bundled with the Scrollutil distribution (and used
   by its demo scripts).

3. When starting the editing session, the "-exportselection" option of
   the tablelist widget is now set to 0 (thus making sure that the
   widget won't lose the selection while a cell's content is being
   edited), and when the editing is finished or canceled, the option's
   original value is restored (thanks to Alexandru Dadalau for his
   proposal).

4. Made sure that the "-showeditcursor" configuration option will work
   as expected also in the special case that the application was cross-
   wrapped on Linux for Windows using freewrap (thanks to Rolf Ade for
   his valuable contribution and discussions on this topic).

5. Overhauled the workaround for the problem that in Tk 8.6.11 and later
   on Mac OS X/11+ the idle callbacks are often fired at unexpected
   times (thanks to Christian Gollwitzer for his bug report and
   discussions on this topic).

6. Fixed a bug related to the handling of the <<ThemeChanged>> event
   when the package Tablelist rather than Tablelist_tile was loaded
   into the interpreter (thanks to Sait Dogru for reporting this bug).

7. Fixed a long-standing bug related to the mouse event handling for the
   header labels in the special case that there is another tablelist
   closely to the left of the widget in question (thanks to Alexandru
   Dadalau for his bug report).

8. Improvements in Tablelist Programmer's Guide.

What was new in Tablelist 6.17?
-------------------------------

1. The virtual event <<TablelistCellUpdated>> is now only generated if
   the editing session has effectively changed the cell's content
   (thanks to Manfred Rosenberger for his input that determined me to
   make this change, which will be useful for applications that perform
   complex actions whenever this event is triggered).

2. Extended the descriptions of the "-tooltipaddcommand" and
   "-tooltipdelcommand" options by hints showing how to use these
   options with version 1.3+ of the baltip package by Alex Plotnikov.

3. The scaleutil package (which is bundled with Tablelist) now works "as
   is" with undroidwish and AndroWish, too.  In addition, as described
   in section "More on tablelist::scalingpct" of Tablelist Programmer's
   Guide, it is now possible to prevent this package from changing Tk's
   scaling factor when calculating the scaling percentage corresponding
   to the display's DPI scaling level on X11 (thanks to Christian Werner
   for his proposal and discussions on these topics).

4. Worked around the problem that on Mac OS X/11+ the idle callbacks are
   often fired at unexpected times (thanks to Torsten Berg for his bug
   report and discussions on this topic).

5. Fixed a bug related to the embedded ttk::checkbutton widgets when the
   package Tablelist rather than Tablelist_tile was loaded into the
   interpreter (thanks to Nicolas Bats, Ralf Fassel, and Jakob Gager for
   reporting this bug).

6. Fixed a bug in the scaleutil package, related to setting the default
   height of the ttk::treeview rows for one of the themes provided by
   the awthemes package (thanks to Harald Oehlmann for his bug report).

What was new in Tablelist 6.16?
-------------------------------

1. Extended the "itemtodict" subcommand by an optional argument that
   specifies the column indices of the elements that are to be ignored
   when building the dictionary that will be returned by the subcommand
   (thanks to Dieter Lonken for his proposal).

2. After handling the mouse wheel events for the binding tag
   "TablelistBody", the default bindings now prevent the processing of
   these events by bindings associated with further tags (like the
   containing toplevel window and "all").  This makes sure that in case
   of a tablelist within a scrollable widget container, the mouse wheel
   events will not at the same time scroll the widget container when the
   pointer is over the tablelist's body.

3. Significantly extended the code responsible for initializing the
   variable "tablelist::scalingpct".  See the section "More on
   tablelist::scalingpct" in Tablelist Programmer's Guide for details.

4. Made sure that the above-mentioned code will work as expected also
   with future Tk versions containing the changes made recently in the
   library file "ttk/fonts.tcl".

5. For the themes "clam", "vista", and "xpnative", the default vertical
   padding of the header labels is now scaled according to the value of
   the variable "tablelist::scalingpct".

6. Improvements related to the appearance of the (temporarily or
   persistently) embedded ttk::checkbutton widgets, especially for the
   theme "clam" and the ones provided by the awthemes package.

7. Fixed a bug related to the "cellbbox" subcommand (thanks to Alexandru
   Dadalau for his bug report).

8. Several further improvements in the code and documentation.

What was new in Tablelist 6.15.1?
---------------------------------

This is a bugfix-only release.  The only corrected file in the "scripts"
directory is "tablelistUtil.tcl".

1. Guarded against potential endless loops, triggered in the previous
   Tablelist release by the presence of hidden columns and a strictly
   positive value of the "-titlecolumns" option (thanks to Johann
   Oberdorfer for his bug report).

What was new in Tablelist 6.15?
-------------------------------

1. Added the "dumptofile" and "loadfromfile" subcommands, inspired by
   some procedures related to a special type of tablelists, posted by
   Helmut Giese on the Wiki (note that these new subcommands are not
   restricted to any particular tablelist type).

2. The "dicttoitem" subcommand no longer expects all dictionary keys to
   be valid column indices; instead, it simply ignores those keys that
   don't fulfill this condition (thanks to Dieter Lonken for his
   proposal).

3. Added code that handles the virtual event <<TkWorldChanged>> with the
   "user_data" field (%d) set to "FontChanged", which, with Tk versions
   later than 8.6.11 and 8.7.a5, will be sent by the Tk engine to all
   widgets when a font is changed, for example, by invoking "font
   configure" (see TIP 608).

4. Adapted the sort rank bitmaps used in multi-column sorting to the
   display's scaling percentage.

5. Worked around a serious regression in Tk 8.6 regarding the text
   widget's "see" subcommand, which caused several performance problems
   in tablelist widgets containing a tree structure (thanks to Helmut
   Giese for reporting some of them on the Wiki).

6. The scrolling in tablelist widgets displaying a tree structure has
   become significantly smoother, due to several further code
   optimizations.

7. Fixed a bug related to the "searchcolumn" subcommand with the
   "-descend" option, which in addition no longer depends on the
   interpreter's maximum nesting depth.

8. Adapted the implementation of the "deletecolumns" subcommand to
   changes made in current Mac OS versions (thanks to Torsten Berg for
   his bug report).

9. Fixed a bug related to the supported scaling percentages on Windows
   (thanks to Manfred Schwarz for his bug report).

What was new in Tablelist 6.14?
-------------------------------

1.  Added support for embedding checkbuttons into the header labels, by
    using the new "-labelwindow" column configuration option, whose
    possible values are "checkbutton" and "ttk::checkbutton" (thanks to
    Alexandru Dadalau and Ralf Fassel for their proposal).

2.  Added the "labelwindowpath" subcommand, used to retrieve the path
    name of the (ttk::)checkbutton widget embedded into a header label.

3.  Added the virtual event <<TablelistActivate>>, generated by the
    default bindings whenever the active row or cell changes due to user
    interaction.

4.  If the value of the "-titlecolums" option is positive then a
    <Shift-MouseWheel> event and the corresponding <Shift-Button-4> and
    <Shift-Button-5> events on X11 now scroll the tablelist widget by
    one column only on all platforms.

5.  The "-stretchwindow", "-windowdestroy", and "-windowupdate" options
    are now supported at column level, too.  Setting these options at
    column rather than cell level will reduce the memory consumption,
    improve the performance, and make the application code simpler.

6.  Extended the "fillcolumn" and "header fillcolumn" subcommands by the
    capability to embed an image or window in all body/header cells of
    the specified column.

7.  The demo scripts "bwidget*.tcl", "iwidgets*.tcl",
    "miscWidgets*.tcl", and "tileWidgets.tcl" now also demonstrate how
    to use the new "-labelwindow" column configuration option and
    "labelwindowpath" subcommand.

8.  The demo scripts "embeddedWindows*.tcl" now set the "-stretchwindow"
    option at column rather than cell level, and embed the windows into
    the cells by using the "fillcolumn" subcommand instead of invoking
    "cellconfigure" in a loop.

9.  Improved the retrieval of the numerical equivalent of a column index
    of the form "@x,y" and the robustness of the code in connection with
    tkcon (thanks to Markus Freiberg for his bug report, profound
    analysis, and discussions on these subjects).

10. On X11, the initialization code now only corrects the sizes of the
    standard fonts and sets the scaling factor if the display's scaling
    percentage is greater than 100.  In addition, the scaling factor is
    no longer changed if the scaling percentage was derived from it
    (thanks to Erik Leunissen and Harald Oehlmann for their bug
    reports).

11. Several further improvements and minor bug fixes (thanks to Emiliano
    Gavilan for his input).

What was new in Tablelist 6.13?
-------------------------------

1. The "expand(all)" and "collapse(all)" subcommands no longer depend on
   the interpreter's maximum nesting depth (thanks to Ulrich Seidl for
   his proposal and discussions on this subject).

2. Drastically reduced the memory consumption of tablelist widgets
   displaying a deeply nested tree structure and significantly improved
   their performance.

3. Added support for macOS 11 (Big Sur), including the new tree style
   "aqua11", which is the default on macOS 11.

4. Reworked the support for the awthemes package and extended it by
   support for the "awbreezedark" theme, introduced in awthemes 10.3.

5. Improvements in the demo scripts "browse(Tree)_tile.tcl",
   "config_tile.tcl", "dirViewer(_tile).tcl", and
   "embeddedWindows(_tile).tcl".

6. Fixed a bug related to font scaling on X11 (thanks to Ulrich Seidl
   for his bug report).

7. Fixed a bug related to the interactive row move operation (again,
   thanks to Ulrich Seidl for his bug report).

8. Several further improvements and minor bug fixes.

What was new in Tablelist 6.12?
-------------------------------

1.  Added support for the platform-independent handling of mouse wheel
    events (TIP 474), introduced in Tk 8.7a4 (as of January 9, 2021).

2.  Added the "-editendonfocusout" configuration option (thanks to
    Alexandru Dadalau and Jakob Gager for their proposals).

3.  Added the "-editendonmodclick" configuration option (thanks to
    Ulrich Seidl for his proposal and discussions on this subject).

4.  Added the "-itembackground" configuration option (thanks to Harald
    Oehlmann for his proposal).

5.  Added the "autoscrolltarget" and "stopautoscroll" subcommands, which
    enable the user to scroll the target tablelist before dropping a
    dragged object into it (thanks to Nicolas Bats for his proposal and
    discussions on this subject).

6.  Further improvements related to the termination of interactive cell
    editing (thanks to Ulrich Seidl for discussions on this subject).

7.  Improved the font scaling on X11 (especially for Xfce and MATE) in
    the calendar component of an iwidgets::dateentry widget used for
    interactive cell editing.

8.  Extended the description of the scaling support on Xfce (including
    version 4.16, which adds fractional scaling), MATE, and Cinnamon.

9.  Fixed a regression related to font scaling on X11 if the display's
    DPI scaling level is greater than 100 %, introduced in the previous
    release.

10. Fixed a few long-standing issues related to the "yview" subcommand
    (thanks to Ulrich Seidl for his bug report).

What was new in Tablelist 6.11?
-------------------------------

1. Updated the "aqua" theme support and extended it by support for the
   Dark Mode appearance, introduced in Mac OS version 10.14 (Mojave).
   When using Tk 8.6.10 or later, the package Tablelist_tile now renders
   the tablelist widgets according to the current system appearance and
   updates them whenever the latter toggles between Light Mode and Dark
   Mode or the Accent Color in the General Preferences changes.  If the
   Tk version is 8.6.11 or later then on Mac OS 10.15 (Catalina) and
   later the tile-based tablelist widgets are also updated when changing
   the Highlight Color in the General Preferences.

2. Added support for the "awdark", "awlight", and the five other themes
   provided by the package awthemes 9.4 or later by Brad Lanam.

3. Added the tree styles "white100", "white125", "white150",
   "white175", and "white200", designed for use with dark themes.

4. Added the virtual event <<TablelistThemeDefaultsChanged>>, sent to
   the main window when handling the virtual events <<ThemeChanged>>,
   <<LightAqua>>, and <<DarkAqua>>.  See the section "The tablelist::
   setThemeDefaults Command" of the manual page "Commands Related to
   Tile Themes" for details.

5. For current Tk versions Tablelist no longer requires that changing
   the theme be done using the "ttk::setTheme" command instead of
   "ttk::style theme use", which was necessary for older tile versions.

6. Improvements related to laying out the widget used for interactive
   cell editing.

7. With Tk 8.6.10 or later, the demo-scripts "browse(Tree)_tile.tcl",
   "config_tile.tcl", "dirViewer_tile.tcl", "embeddedWindows_tile.tcl",
   and "tileWidgets.tcl" now fully support the Dark Mode appearance on
   Mac OS 10.14 and later (see also the section "Tile-Based Demo
   Scripts" in Tablelist Programmer's Guide).  The same demo-scripts
   also support the themes provided by the awthemes package.

8. Reworked the invocations of "package vcompare", taking into account
   that Tcl versions earlier than 8.5 did not support the letters "a"
   and "b" in version numbers (thanks to Mike Walsh for his bug report).

9. Several further improvements in the code, demo scripts, and
   documentation.

What was new in Tablelist 6.10?
-------------------------------

1. Made the variable "tablelist::scalingpct" read-only.

2. Extended the initialization of the variable "tablelist::scalingpct"
   by scaling: (a) the default width of the Tk core scrollbars on X11;
   (b) for the built-in themes "alt", "clam", "classic", and "default",
   the default width of the ttk::scrollbar widget, as well as the arrows
   of the ttk::combobox and ttk::spinbox widgets; (c) for the "alt" and
   "clam" themes, the arrow of the ttk::menubutton widget; (d) for the
   "clam", "classic", and "default" themes, the indicators of the
   ttk::checkbutton and ttk::radiobutton widgets.

3. Made sure that in the "vista" and "xpnative" themes the indicators of
   the ttk::checkbutton and ttk::radiobutton widgets will be properly
   scaled, regardless of the Tk release being used (a long-standing bug
   in the implementation of these widgets was fixed in May 2020).

4. Automatic scaling of the default arrow style on the windowing system
   "x11" and for a few tile themes, like "alt", "clam", and "default":
   Now the default value of the "-arrowstyle" option can be, besides
   "flat8x4", one of "flat9x5", "flat11x6", "flat13x7", and "flat15x8",
   depending on the value of the variable "tablelist::scalingpct".

5. The temporarily embedded widgets used for interactive cell editing
   now will appear properly scaled, thanks to additional improvements
   related to the editing with the aid of Tk core checkbutton, BWidget
   SpinBox, BWidget ComboBox, iwidgets::dateentry, iwidgets::timeentry,
   iwidgets::combobox, and Oakley combobox widgets.  A tile widget used
   for cell editing will be properly scaled in all built-in themes; the
   only exception is ttk::checkbutton, which cannot be scaled if the
   theme is "alt" or "winnative".

6. Made all demo-scripts scaling-aware.

7. Several further improvements in the code and documentation, as well
   as minor bug fixes.

What was new in Tablelist 6.9?
------------------------------

1. Significantly extended and improved the code for initializing the
   variable "tablelist::scalingpct", especially on X11, including GNOME
   and KDE on both Xorg and Wayland, Solus and Ubuntu Budgie, Cinnamon,
   MATE, and Xfce.  This variable now has the additional value 175.  See
   the new section "More on tablelist::scalingpct" in Tablelist
   Programmer's Guide for details.

2. Corresponding to the new scaling percentage 175, added the arrow
   styles "flat13x7", "flatAngle13x7", and "photo13x7".  Removed the not
   really useful arrow styles "flat5x3" and "flat5x4" (POTENTIAL
   INCOMPATIBILITY!).

3. Changed the tree style names "plain1", ..., "plain4" to the more
   suggestive ones "plain100", "plain125", "plain150", and "plain200",
   and added the tree style "plain175".  Similar changes for the tree
   styles "bicolor*" and "classic*".  POTENTIAL INCOMPATIBILITY!

4. The demo scripts "dirViewer.tcl" and "dirViewer_tile.tcl" now also
   demonstrate how to use the variable "tablelist::scalingpct" for
   developing scaling-aware applications.

5. Adapted the look & feel of the tree style "ubuntuMate" to version
   20.04 of the Ubuntu MATE distribution.

6. Made the "refreshsorting" subcommand by orders of magnitude faster
   (thanks to Ulrich Seidl for reporting the poor performance of this
   subcommand).

7. Fixed an issue related to the bindings for the edit window, which
   prevented the triple-clicks from being handled by the class bindings
   of the edit widget (thanks to Ulrich Seidl for his bug report and
   discussions on this subject).

8. Fixed a bug related to the "expand" subcommand for a list of indices
   (again, thanks to Ulrich Seidl for his bug report).

9. Several further improvements in the code and documentation, as well
   as minor bug fixes.

What was new in Tablelist 6.8?
------------------------------

1. Updated and significantly improved the support for Windows 10.

2. Adapted the "aqua" theme support to Tk release 8.6.10.  Note that
   this was tested on Mac OS X 10.13.6 (High Sierra) and currently
   doesn't support the "Dark Mode" appearance, introduced in Mac OS X
   version 10.14 (Mojave).

3. When computing the number of units for "(x|y)view scroll" within the
   bindings for mouse wheel events, the rounding now works the same for
   both positive and negative delta values, just like in Tk 8.6.10 and
   later.

4. For Tk 8.7.a3 and above on X11, the mouse wheel event handling now 
   includes bindings for horizontal scrolling with the aid of the
   (virtual) mouse buttons 6 and 7, which correspond to left/right
   tilting the scroll wheel of a mouse having one or two additional
   (thumb) buttons.

5. The tile-based demo scripts now use ttk::scrollbar widgets for the
   "aqua" theme, too, provided that the Tk release is 8.6.10 or later.

6. Several further improvements in the code and documentation.

What was new in Tablelist 6.7?
------------------------------

1. Optimized the horizontal scrolling by units (thanks to Nicolas Bats
   for his input).

2. Many improvements related to the "aqua" theme.

3. Tablelist no longer creates aliases in the "::tk" namespace for Tk
   commands for which that namespace already contains a command of the
   same name (thanks to Juge for his input).

4. Made sure that the commands specified as the values of the
   "-xscrollcommand" and "-yscrollcommand" options will only be invoked
   if the view's data have changed.  This prevents a potential endless
   loop when scrolling several tablelists simultaneously with the aid of
   the scrollutil::scrollsync widget (thanks to Paul Obermeier for his
   bug report).

5. Fixed a bug introduced in Tablelist 6.2, related to the "scan"
   subcommand.

6. Several further improvements in the code and documentation.

What was new in Tablelist 6.6?
------------------------------

1. Added mouse bindings for setting, extending, and toggling the column-
   wise cell selection with the aid of the header labels if the
   selection type is "cell" (thanks to Nicolas Bats for his proposal,
   testing, and discussions on this subject).

2. New "-selectfiltercommand" widget and column configuration option,
   which can be used for filtering the cells that are to be selected by
   the column-wise cell selection operation (again, thanks to Nicolas
   Bats for his proposal, testing, and discussions on this subject).

3. Improvements related to the interactive editing of multi-line cells
   (thanks to Johann Oberdorfer for his proposal).

4. Adapted the look & feel of the tree style "adwaita" to current
   versions of the GTK+ 3 theme Adwaita.

5. Improved the description of the "-height" option in the reference
   manual and extended it by a hint concerning the desired height in
   rows (thanks to Jakob Gager for discussions on this subject).

6. The reference manual now contains several links to the new Scrollutil
   package, along with an example showing how the scrollutil::scrollarea
   widget can be used to make the creation of a scrolled tablelist quite
   simple.

7. Eliminated the flickering in the presence of header items, introduced
   in Tablelist 6.5 (thanks to Johann Oberdorfer for reporting this
   regression).

8. Fixed a long-standing bug related to the "move" subcommand (thanks to
   John J. Seal for his bug report).

9. Several further improvements and minor bug fixes.

What was new in Tablelist 6.5?
------------------------------

1. Support for the new virtual events <<TablelistHeaderHeightChanged>>
   and <<TablelistTitleColsWidthChanged>>, generated when the header's
   height or the total width of the viewable title columns,
   respectively, has changed.

2. Optimized the vertical scrolling by units (thanks to Nicolas Bats for
   his input).

3. Minor improvement related to the appearance of embedded checkbuttons
   on X11.

4. Fixed a bug introduced in Tablelist 6.4, related to the "-showlabels"
   option (thanks to Jakob Gager for his bug report).

5. Fixed a few bugs specific to Mac OS X Aqua, introduced in Tablelist
   6.4 (thanks to Paul Obermeier and Nicolas Bats for their bug
   reports).

6. Fixed a bug related to the handling of mouse wheel events during
   interactive cell editing, introduced in Tablelist 6.4 (thanks to
   Alexandru Dadalau for his bug report).

7. Fixed a bug related to the "move" subcommand, introduced in Tablelist
   6.3 (thanks to Jose Luis Lijo and Bo Berggren for their bug reports).

8. Several further improvements in the code and documentation.

What was new in Tablelist 6.4?
------------------------------

1. Added the "-xmousewheelwindow" and "-ymousewheelwindow" configuration
   options, which make it possible to redirect the mouse wheel events of
   the tablelist's body to the containing scrollable window or toplevel
   widget in case the focus is outside the tablelist (thanks to Michael
   Niehren for discussions on this subject).

2. Optimized the deletion of a list of items (thanks to Martin Lemburg
   for his proposal).
   
3. Improved the performance of the vertical scrolling (thanks to Olivier
   Jolet for discussions on this subject).

4. Eliminated a potential endless loop triggered by key navigation with
   the "aqua" theme and selection type "cell" (thanks to Michael
   Grundler for his bug report).

5. Fixed a regression introduced in Tablelist 6.3, related to the
   handling of the "-listvariable" option when using Itcl 3.x (thanks to
   Ralf Fassel for his bug report and valuable contribution).

6. Fixed another regression introduced in Tablelist 6.3, related to
   clearing the multiple or extended selection (thanks to Martin Lemburg
   for his bug report).

7. Several further improvements and minor bug fixes in the code and
   demo scripts.

What was new in Tablelist 6.3?
------------------------------

1.  Added the "-showbusycursor" configuration option, used to control
    whether the default bindings should display a busy cursor during the
    actions that can take a long time to complete, using the new
    "setbusycursor" and "restorecursor" subcommands.

2.  The "-stretch" configuration option is no longer ignored if the
    width of the tablelist widget was specified as zero or less (thanks
    to Adrian Medrano Calvo for his proposal).  For technical reasons
    there is just a minor restriction, which is only relevant on X11: If
    the value of the "-width" option is zero or less and the tablelist
    has stretchable columns, then the "-setgrid" option will be ignored.

3.  The vertical scrollbar, when managed with the aid of the
    "cornerpath" subcommand, will now appear below the entire header,
    including both the header labels and the header items (if any).

4.  Besides the north-east corner frame there is now a south-west corner
    frame, designed to be used when managing the horizontal scrollbar
    in the presence of title columns.  The "cornerpath" subcommand now
    accepts the corner specification as optional argument.

5.  Significant optimizations in the item insertion as well as in the
    selection-related code (thanks to Johann Oberdorfer for testing and
    discussions on this subject).

6.  Adapted to some changes in future Tcl and Tk releases (for example,
    made sure that it works with Tcl 9.0 and Tk 8.7).

7.  Further improvements related to the interactive cell editing with
    the aid of the ctext widget (thanks to Sait Dogru for discussions on
    this subject).

8.  Made the overall handling of the "-listvariable" option much more
    robust (thanks to Ulrich Seidl for his bug report).

9.  Fixed a long-standing bug related to the "-maxwidth" column
    configuration option (again, thanks to Ulrich Seidl for his bug
    report).

10. Fixed a bug related to the "-displayondemand" configuration option
    (thanks to "tombert" for his bug report).

11. Fixed a bug related to the tooltip support (thanks to Bo Berggren
    for his bug report).

12. Fixed a bug related to the "rowconfigure" subcommand, introduced in
    Tablelist version 6.0 (thanks to Ulrich Seidl for his bug report).

13. Numerous further improvements and minor bug fixes.

What was new in Tablelist 6.2?
------------------------------

1. Added the "-labelvalign" column configuration option, for controlling
   the vertical alignment of header label images (thanks to Johann
   Oberdorfer for his proposal).

2. The "collapse" and "expand" subcommands now accept a list of indices
   as first argument (thanks to Ulrich Seidl for his proposal).  This is
   much more efficient than a series of invocations for individual rows.

3. Significantly improved the overall performance of tablelist widgets
   containing a tree structure, embedded images, or multi-line cells
   (thanks to Ulrich Seidl for reporting some performance-related
   issues in tree widgets).

4. Important improvements related to the scanning performance and
   behavior (thanks to Johann Oberdorfer for discussions on this
   subject).

5. Changed the default arrow style "flat7x5" to "flat8x4" on the
   windowing system "x11" and for the tile themes "alt", "clam",
   "default", "kroc", "sriv", "srivlg", and "step" (POTENTIAL
   INCOMPATIBILITY!).

6. The manual now recommends managing the vertical scrollbar (if any) to
   appear below the header labels with the aid of the "cornerpath"
   subcommand not only for Mac OS X Aqua but also for X11.  The demo
   scripts have been adapted accordingly.

7. Fixed two minor bugs related to the interactive cell editing with the
   aid of the ctext widget (thanks to Sait Dogru for his bug report).

8. Fixed a long-standing bug related to the handling of the
   "-listvariable" option in connection with snit widgetadaptors (thanks
   to Rolf Ade for his bug report).

9. Several further code improvements and minor bug fixes (thanks to
   Alexandru Dadalau and Bernhard Wallner for their bug reports).

What was new in Tablelist 6.1?
------------------------------

1. Added the "-imagebackground" cell configuration option, useful for
   embedded images having (partially) transparent regions (thanks to
   Jose Luis Lijo for his proposal).

2. Extended the description of the "bodytag" subcommand in the
   reference manual by examples showing how to register the body of a
   tablelist widget as a drag source in such a way that the drag works
   also for the separators, multi-line cells, and embedded images.

3. Eliminated a regression related to both temporarily and persistently
   embedded Tk checkbuttons on Windows, introduced in the previous
   Tablelist version (thanks to Johann Oberdorfer, Jyrki Majamaeki, and
   Ralf Fassel for their bug reports).

What was new in Tablelist 6.0?
------------------------------

1. Added support for header items (aka title rows) with the aid of the
   new "header", "headerpath", and "headertag" subcommands.  The first
   one supports a great number of subcommands itself, like
   "insert(list)", "delete", "size", "rowconfigure", "cellconfigure",
   "get(formatted)", "get(formatted)cells", etc. (thanks to Hemang
   Lavana, Kenneth Green, and Ralf Fassel for their proposals).  The
   demo scripts "embeddedWindows.tcl" and "embeddedWindows_tile.tcl" now
   contain invocations of "header insert" and "header rowconfigure".

2. Added the "embed(ttk)checkbutton" and "embed(ttk)checkbuttons"
   subcommands, which provide interactive cell editing with the aid of
   persistently embedded checkbuttons (thanks to Mark Garvey and Holger
   Jakobs for their proposal).  The Tablelist Programmer's Guide now
   contains an example of usage of the "embedcheckbuttons" subcommand.

3. Compatibility with the revised implementation of the text widget,
   which will be contained in Tk 8.7 (thanks to Brad Lanam, Gregor
   Cramer, and Francois Vogel for their valuable assistance).

4. The "dicttoitem" and "itemtodict" subcommands are now supported in
   the presence of alternative, Tcl-only "dict" implementations, too
   (thanks to Andy Goth for his proposal).

5. Deleting all items has become by orders of magnitude faster (thanks
   to Martin Lemburg for requesting this performance improvement).

6. Guarded against invocations of the "update" command from within the
   command specified as the value of the "-tooltipaddcommand" option
   (thanks to Alexandru Dadalau for his bug report and discussions on
   this subject).

7. Made sure that the "xview" and "yview" subcommands work as expected
   even if the script was started from wthin a C application in which
   the decimal point is different from "." (thanks to Paul Obermeier for
   his bug report).

8. Numerous further improvements in the code, demo scripts, and
   documentation.

What was new in Tablelist 5.18?
-------------------------------

1. Improved the performance of the vertical scrolling (thanks to
   Alexandru Dadalau and Olivier Jolet for discussions on this subject).

2. Added the "-displayondemand" configuration option, which can be used
   to speed up the scrolling even further.

3. Added the "tablelist::delaySashPosUpdates" command (described in the
   manual page "Commands Related to Binding Scripts"), designed to
   control the frequency of the sash position updates for a given
   panedwindow widget, which might be necessary to eliminate some
   artifacts if some of the panes contain tablelist widgets with
   embedded images (thanks to Nicolas Robert for his input).

4. Added support for the themes "Arc" and "clearlooks"; updated the
   support for the themes "Aquativo", "blue", "clam","keramik",
   "keramik_alt", and "plastik".

5. Extended the reference manual by the description of an important use
   case for the "-formatcommand" column configuration option, related to
   tablelist columns whose "-sortmode" option was set to "integer" or
   "real" (thanks to Alexandru Dadalau for discussions on this subject).

6. Fixed a bug related to retrieving the current cell selection (thanks
   to Alexandru Dadalau for his bug report).

7. Fixed a bug related to excluding the "dicttoitem" and "itemtodict"
   subcommands for Tk 8.4 and earlier (thanks to Andy Goth for his bug
   report).

8. Numerous further improvements in the code, demo scripts, and
   documentation.

What was new in Tablelist 5.17?
-------------------------------

1. Added the tree styles "arc", "blueMenta", "menta", "ubuntuMate", and
   "ubuntu3", inspired by the Arc icon theme (of the GTK 2/3 theme Arc)
   and some GTK 3 themes of the latest versions of the MATE desktop and
   Ubuntu Linux distribution, respectively.

2. Added the "dicttoitem" and "itemtodict" subcommands (thanks to Denis
   Rheault for his proposal).

3. Support for the new virtual event <<TablelistViewUpdated>>,
   generated when the tablelist widget has finished updating its view
   (thanks to Martyn Smith for his proposal).

4. Added the boolean variable tablelist::strictTk, which controls the
   strict listbox-compatibility of the default bindings.  If its value
   is false (which is the default) then <Control-Button-1> now toggles
   the selection state of the item or element under the mouse in all
   selection modes, and <Control-space> and <Control-Select> toggle the
   selection state of the active item or element (thanks to Alexandru
   Dadalau for discussions on a related subject).

5. The default bindings on X11 and Windows now support the keyboard
   shortcuts <Control-a> and <Shift-Control-A> as alternatives to the
   key sequences <Control-slash> (for "Select All") and
   <Control-backslash> (for "Deselect All") (thanks to Juge, Alexandru
   Dadalau, Christian Gollwitzer, Rich, and Andreas Leitgeb for
   discussions on a related subject).

6. Improvements related to vertical scrolling, especially in the
   presence of embedded images or multi-line elements (thanks to Olivier
   Jolet for discussions on this subject).

7. Improvements in the documentation (thanks to Adam Jensen for his
   input).

What was new in Tablelist 5.16?
-------------------------------

1.  Added the "-autofinishediting" configuration option, relevant for
    interactive cell editing via a combobox or menubutton widget (thanks
    to Alexandru Dadalau for his proposal).

2.  On Windows Vista, 7, 8, and 10, the sort arrows are now shown
    horizontally centered in the header labels and attached to their top
    edges.

3.  Added the arrow style "photo7x4" as well as its automatically scaled
    versions "photo9x5", "photo11x6", and "photo15x8", used as defaults
    on Windows Vista, 7, and 8.

4.  Added the tree style "mint2", suiting version 18 of the Linux Mint
    distribution.

5.  Support for fully qualified edit window names of the form "::ttk::*"
    (thanks to Adrian Medrano Calvo for his proposal).

6.  Worked around a text widget issue introduced in Tk 8.6.6 (thanks to
    Peter Spjuth, Harald Oehlmann, and Rene Zaumseil for their valuable
    input).

7.  Improvements related to the "move" and "movecolumn" subcommands as
    well as to the management of the images used in sort arrows (thanks
    to Adrian Medrano Calvo and Torsten Berg for their proposals).

8   Drastically increased the speed of the "collapse" and "collapseall"
    subcommands with the "-fully" option (thanks to Ulrich Seidl for
    reporting the poor performance of "collapseall -fully").

9.  Adapted the implementation of the "delete" subcommand to the changed
    text widget behavior in Tk 8.6.5 (thanks to Ulrich Seidl for his bug
    report).

10. Fixed a bug related to the "curcellselection" subcommand (thanks to
    Juge for his bug report).

What was new in Tablelist 5.15?
-------------------------------

1. Support for Windows 10, including the new tree style "win10", whose
   size is automatically adapted to the display's scaling level.

2. Added the arrow styles "flatAngle11x6" and "flatAngle15x8", needed
   for automatic scaling of the default arrow style "flatAngle7x4" on
   Windows 10.

3. The variable "tablelist::scalingpct", used by Tablelist when adapting
   the sizes of several tree styles to the display's DPI scaling level,
   is now documented in Tablelist Programmer's Guide.

4. Worked around a text widget bug introduced in Tk 8.5.18 and 8.6.4
   (fixed for the next Tk versions).

5. Fixed a bug that prevented the subcommands "see end", "see last", and
   "yview moveto 1" from working as expected if the tablelist widget
   contains multi-line cells or large images (thanks to Harald Oehlmann
   for his bug report and to Francois Vogel for discussions on this
   subject).

What was new in Tablelist 5.14?
-------------------------------

1. Added the "-colorizecommand" configuration option, enabling you to
   change the colors of arbitrary character regions within the cells of
   the currently visible tablelist rows (thanks to Peter Spjuth for his
   proposal).

2. The "curcellselection" and "curselection" subcommands now accept an
   optional argument with the possible values "-all", "-nonhidden", and
   "-viewable" (thanks to Will Duquette for his proposal).

3. Added the tree styles "plain1", ..., "plain4", "bicolor1", ...,
   "bicolor4", and "classic1", ..., "classic4", suitable for use with
   large fonts and images (needed on high-resolution displays).  In
   addition, the sizes used by the tree styles "vistaAero",
   "vistaClassic", "win7Aero", and "win7Classic" are now automatically
   adapted to the display's scaling level (thanks to Harald Oehlmann for
   his proposal).

4. On Windows Vista and later, automatic scaling is now performed for
   the default arrow style, too.  This made is necessary to add the
   arrow styles "flat11x6" and "flat15x8".

5  Added the arrow style "flat8x4" and the tree style "ubuntu2", suiting
   version 15.04 of the Ubuntu Linux distribution.  Similarly, added the
   tree style "yuyo", inspired by the GTK+ theme Yuyo on Ubuntu MATE.

6. Changed the default arrow color "" and arrow style "sunken10x9" to
   "black" and "flat7x5" on the windowing system "x11" and for the tile
   themes "alt", "clam", "default", "kroc", "sriv", "srivlg", and "step"
   (POTENTIAL INCOMPATIBILITY!).

7. In case of "-selecttype cell", the row containing the active cell is
   now displayed with raised relief (thanks to Holger Jakobs for his
   proposal).

8. Guarded against invocations of the "update" command from within
   binding scripts associated with the <<TablelistSelect>> virtual
   event (thanks to Martyn Smith for his bug report and discussions on
   this topic).

9. Worked around some unexpected events in certain X11 environments,
   which prevented Tablelist 5.13 from starting the interactive cell
   editing in such environments (thanks to Toni Giorgino for his bug
   report and helping me to reproduce this problem).

What was new in Tablelist 5.13?
-------------------------------

1. Added support for Mac OS X 10.10 (Yosemite) (thanks to Kevin Walzer
   for his proposal).

2. Renamed the four arrow styles having the shape of an angle from
   "flat7x5", ..., "flat10x6" to "flatAngle7x5", ..., "flatAngle10x6"
   (POTENTIAL INCOMPATIBILITY!); added the arrow styles "flat7x5",
   "flat9x6", "flatAngle7x4" (which is now the default on Yosemite),
   "flatAngle9x5", and "flatAngle10x7".

3. Added the tree style "mate", inspired by a few GTK+ themes of the
   MATE desktop.

4. Added the "-showeditcursor" configuration option, used to let the
   cursor take on the shape of a pencil whenever a mouse click would
   start an editing session (thanks to Rene Zaumseil and Cesare
   Bavazzano for their proposals).

5. New column configuration option "-changetitlesnipside", which allows
   you to override the alignment-specific default snip side for the
   column's title (thanks to John Vella for his proposal).

6. Support for the word "last" as row, column, cell, or child index,
   indicating the last row/column/cell of the tablelist or the last
   child of a given parent node (remember that the meaning of "end" as a
   row, column, or child index is subcommand-specific).

7. The description of the "imagelabelpath" subcommand in the reference
   manual now contains an example showing how to define bindings for the
   embedded images.

8. Eliminated the endless loop generated by the "yview" subcommand when
   synchronizing two or more tablelist widgets (thanks to Paul Obermeier
   for his bug report).

What was new in Tablelist 5.12.1?
---------------------------------

This is a bugfix-only release.  The corrected files in the "scripts"
directory are "tablelistEdit.tcl" and "tablelistUtil.tcl".

1. Appended the missing 4th argument to the two invocations of the
   procedure "tablelist::moveOrActivate" in the file
   "tablelistEdit.tcl" (thanks to Patrick Fradin and Ralf Fassel for
   their bug reports).

2. Fixed a typo in the file "tablelistUtil.tcl" (thanks to Patrick
   Fradin for reporting this bug).

What was new in Tablelist 5.12?
-------------------------------

1. Added the "-customdragsource" configuration option, used to indicate
   whether the tablelist widget is a drag source for some drag & drop
   implementation other than TkDND and the drag & drop framework
   included in BWidget.

2. Improvements and extensions in the default binding scripts.  Besides
   providing full compatibility with the Tk listbox, they now perform an
   automatic drag-friendly handling of the selection and of pointer
   movements with mouse button 1 down if the "-customdragsource" option
   was set to true or the tablelist's body was registered as a TkDND or
   BWidget drag source (thanks to Will Duquette for his proposal).  The
   same holds true for the local drag & drop via the "move" subcommand.

3. Added the "hidetargetmark", "showtargetmark", "targetmarkpath", and
   "targetmarkpos" subcommands, for enhanced drop target support (thanks
   to Trevor Williams for his proposal).

4. Added a "Drag & Drop Support" section to the reference manual, with
   examples demonstrating the use of the new subcommands mentioned
   above in a tablelist widget registered as a TkDND or BWidget drop
   target.

5. The visibility of the horizontal separator placed just below the last
   tablelist row if the value of the "-showseparators" option is true
   and that of the "-fullseparators" option is false, can now be 
   controlled with the aid of the new "-showhorizseparator"
   configuration option (thanks to Martyn Smith for his proposal).

6. New values "flat5x3" and "flat5x4" for the "-arrowstyle"
   configuration option, suiting current versions of the Ubuntu Linux
   distribution.

7. Adapted the look & feel of the tree styles "adwaita", "ubuntu", and
   "mint" to current versions of the GTK+ 3 theme Adwaita and of the
   Linux distributions Ubuntu Linux and Linux Mint, respectively.

8. Fixed a long-standing bug related to horizontal scrolling in an empty
   tablelist widget with positve "-titlecolumns" value (thanks to Ulrich
   Seidl for his bug report).

What was new in Tablelist 5.11?
-------------------------------

1. Added the "findrowname" and "findcolumnname" subcommands (thanks to
   Adrian Medrano Calvo for his proposal and discussions on this
   subject).

2. Collapsing a row no longer leads to renumbering the lines for the
   purpose of updating a column configured to display the line numbers
   (thanks to Will Duquette for his proposal).

3. For improved appearance, if the value of the "-showseparators" option
   is true and that of the "-fullseparators" option is false, then a
   horizontal separator is now placed just below the last tablelist row
   (thanks to Allan Silverstein for his proposal).

4. Worked around a peculiarity of Tk on Windows, which caused problems
   when resizing the tablelist window in the presence of embedded images
   or multi-line elements (thanks to Will Duquette for his bug report).

5. Added the missing actualization of the active and anchor row indices
   after moving an item to a different position (thanks to Will Duquette
   for his bug report).

6. Fixed two bugs in Tablelist_tile, related to header labels with
   embedded images (thanks to Ulrich Seidl for his bug reports).

7. Numerous further improvements in the code and documentation.

What was new in Tablelist 5.10?
-------------------------------

1.  Added the "-acceptdropcommand" configuration option, used to control
    whether the local drag & drop may move a specified item just before
    a given row (thanks to Nagu and Georgios Petasis for discussions on
    this subject).

2.  Added the "-instanttoggle" configuration option, related to the cell
    editing with the aid of a Tk or tile checkbutton (thanks to Rich
    Wellner for his proposal and discussions on this topic).

3.  Added the "-tight" configuration option, used to eliminate the
    one-pixel additional space left below each tablelist row for Tk
    listbox compatibility (thanks to Koen Breugelmans for his proposal
    and discussions on this subject).

4.  Added the "isviewable" and "viewablerowcount" subcommands (thanks to
    Nagu for proposing the latter).

5.  Improvements related to the value of the "-data" option for the
    virtual events <<TablelistColumnMoved>> and <<TablelistRowMoved>>
    (thanks to Georgios Petasis for discussions on this topic).

6.  The item deletion has become significantly faster, especially in
    tablelists used as tree widgets and in the presence of embedded
    images and/or multi-line elements (thanks to Rob Ratcliff and Rene
    Zaumseil for requesting this performance improvement).

7.  Guarded against column deletions from within non-default binding
    scripts for the header labels (thanks to Ulrich Seidl for his
    input).

8.  Restored the support for Tcl/Tk versions earlier than 8.3, by
    cleaning up the use of elided text in the underlying text widget.
    Similarly, restored the support for Tcl/Tk 8.0, by cleaning up the
    use of "regsub" and that of the <MouseWheel> event (thanks to Joerg
    Mueck for reporting the first two issues).

9.  Improved the package loading mechanism (thanks to Paul Obermeier for
    his bug report).

10. Guarded against potential item insertions or deletions from within
    the command specified as the value of the "-editendcommand" option
    (thanks to Julian H J Loaring for his bug report).

11. Guarded against deletion of embedded images or windows from within
    the command specified as the value of the "-tooltipaddcommand"
    option (thanks to Jan Kandziora for his bug report).

12. Fixed a bug related to column deletion if the "-selecttype" option
    has the value "cell" (thanks to Ulrich Seidl for his bug report).

13. Several further code improvements and minor bug fixes.

What was new in Tablelist 5.9?
------------------------------

1. Added the "-valign" column and cell configuration option, for
   controlling the vertical alignment of embedded images and windows
   (thanks to Trevor Williams for his proposal).

2. The "-stripebackground" and "-stripeforeground" options can now be
   specified at column level, too (thanks to Christian Gollwitzer for
   his proposal).

3. Improvements related to the Windows 7 platform.

4. Worked around a text widget bug in Tk versions 8.5 and later, related
   to getting the index of the last line in the window if some of the
   lines are elided (thanks to Bernhard Wallner for his bug report).

5. Corrected a typo in the implementation of the "rowconfigure"
   subcommand, introduced in the last Tablelist version (thanks to Jerzy
   Witkowski for reporting this bug).

6. Fixed a bug related to resetting the "-(select)background" and
   "-(select)foreground options at column, row, and cell levels,
   introduced in the previous Tablelist version (thanks to Christian
   Gollwitzer for his bug report).

7. Several further improvements in the code, demo scripts, and
   documentation.

What was new in Tablelist 5.8?
------------------------------

1.  Support for interactive cell editing with the aid of the ctext
    widget (thanks to Sait Dogru for his proposal).

2.  Added the "canceledediting" subcommand (thanks to Martyn Smith for
    his proposal).

3.  The "selection" and "cellselection" subcommands have become by
    orders of magnitude faster (thanks to Jean-Francois Beaud for his
    input that motivated me to speed up these subcommands).

4.  The "-(select)background" and "-(select)foreground options at
    column, row, and cell levels now impose by far less performance
    penalty than in earlier Tablelist versions.

5.  The keyboard traversal during interactive cell editing is now aware
    of changes like appending a new row, performed by the procedure
    specified as the value of the "-editendcommand" configuration option
    (thanks to Andreas Leitgeb for his proposal).

6.  For Tk versions 8.5 or later, most virtual events are now generated
    with the "-data" option set to a suitable event-specific value
    (thanks to Christian Gollwitzer, Andreas Leitgeb, and Nagu for their
    proposals).

7.  Improvements related to the selection mode "extended".

8.  Worked around a peculiarity of Tk on Windows, related to deleting an
    embedded window while resizing a text widget interactively (thanks
    to Harald Oehlmann for his bug report and discussions on this
    topic).

9.  Eliminated a regression introduced in Tablelist version 5.6, related
    to vertical scrolling under Tk 8.5 or later in the presence of
    embedded images or windows (thanks to Patrick Fradin for reporting
    this bug).

10. Fixed a screen refresh problem introduced in Tablelist version 5.6,
    related to wrapped multiline elements (thanks to Rob for his bug
    report).

11. Further code improvements (thanks to Harald Oehlmann for his
    valuable contribution).

12. Added a "Virtual Events" section to the reference manual (thanks to
    Andreas Leitgeb for his proposal).

What was new in Tablelist 5.7?
------------------------------

1.  Added the "cellbbox" subcommand.

2.  Added the "editinfo" subcommand (thanks to Trevor Williams for his
    proposal).

3.  Adapted the tree styles "ubuntu" and "mint" to the latest Ubuntu
    Linux and Linux Mint releases.

4.  Minor change related to the ttk::combobox widget used as edit window
    (thanks to Julian H J Loaring for his input).

5.  Improved the multi-platform support by increased use of virtual
    events.

6.  Worked around a bug in some earlier Tk versions, related to
    checkbuttons without indicator (thanks to Allan Silverstein for his
    input).

7.  Restored the support for Tcl/Tk versions earlier than 8.4, which has
    been broken since the previous Tablelist release, due to the use of
    the "namespace exists" command, introduced in Tcl 8.4 (thanks to
    Ralf Fassel for drawing my attention to this issue).

8.  Fixed a copy & paste bug related to embedded windows, introduced in
    the previous Tablelist version (thanks to Heng Li and David Hanks
    for their bug reports).

9.  Fixed a long-standing bug related to the "cancelediting" subcommand
    and the "-forceeditendcommand" option (thanks to Julian H J Loaring
    for his bug report).

10. Fixed a long-standing minor bug that caused the "-labelbg" column
    configuration option to be accepted by Tablelist_tile, contrary to
    the option of the same name at widget level (thanks to Bernhard
    Wallner for his bug report).

11. Several further improvements in the code and demo scripts (thanks to
    Patrick Fradin for his valuable contribution and to Marianne Baumann
    for her input related to the "-showlabels" option).

What was new in Tablelist 5.6?
------------------------------

1.  Added the tree styles "adwaita", "mint", and "ubuntu", inspired by a
    few GTK+ 3 themes on popular Linux distributions.

2.  Added the "-windowupdate" cell configuration option (thanks to
    Trevor Williams for his valuable contribution).

3.  The item insertion and sorting have become significantly faster,
    especially when using static-width columns.

4.  Embedded windows are now hidden during interactive cell editing
    (thanks to Trevor Williams for discussions on this subject).

5.  Extended the support for the "tileqt" theme to work on KDE 4, too.

6.  Improvements in the documentation (thanks to Glenn Herteg for his
    proposal).

7.  Guarded against the case that a tablelist widget is deleted and its
    name is reused for a widget of a different class (thanks to Roger
    Niva for his valuable input).

8.  Guarded against scripts that start by destroying all children of the
    root window (thanks to Helmut Giese and Gerhard Kraus for drawing my
    attention to this case).

9.  Fixed two bugs related to the "move" subcommand, introduced in
    Tablelist version 5.2 (thanks to "DrS" and Trevor Williams for their
    bug reports).

10. Several further improvements and minor bug fixes.

What was new in Tablelist 5.5?
------------------------------

1. Hidden tablelist elements are no longer excluded from the selection
   (thanks to Martyn Smith for his proposal).  (They are, however,
   ignored when exporting the selection.)

2. Added the "cornerpath" and "cornerlabelpath" subcommands.  The first
   one makes it quite easy to respect the native Mac OS X look & feel,
   where the vertical scrollbar appears placed under the header (thanks
   to Torsten Berg for a related page on the Wiki, which provided me the
   idea for these subcommands).  The "cornerpath" subcommand is now used
   in all demo scrips that contain vertical scrollbars.

3. Added support for the appearance-related changes introduced in Mac
   OS X 10.7 (Lion).

4. On Mac OS X Aqua, the default values of the "-move(column)cursor"
   and "-resizecursor" options are now native cursors.  Besides
   improving the look & feel of tablelist widgets on the Mac, this
   change also works around the problem that on Mac OS X 10.7, Tk
   versions 8.5 and 8.6 can only use native and native-mapped cursors.

5. Removed the "-labelbackground" option from Tablelist_tile, because
   current versions of the tile engine no longer support setting the
   background color for the header labels (and even with earlier tile
   versions, some themes ignored any attempt to change the background
   color of the header labels).

6. Adapted the code to some changes in current tile versions, to make
   sure that in disabled state the tile-based column labels will appear
   in the theme-specific disabled foreground color, as it was the case
   with earlier tile versions (thanks to "tombert" for his related
   posting on comp.lang.tcl).

7. Improved a few binding scripts (thanks to Ulrich Seidl for his bug
   report and testing).

8. Fixed a bug related to embedded windows in a tablelist used as a
   tree widget (again, thanks to Ulrich Seidl for his bug report and
   testing).

9. Several further improvements in the code, demo scripts, and
   documentation.

What was new in Tablelist 5.4?
------------------------------

1. Added the "-populatecommand" configuration option, used by the
   "searchcolumn" subcommand to insert child items on demand before
   checking whether they contain the specified pattern.
   
2. Added the "-autoscan" configuration option, which can be used to
   deactivate the automatic scrolling triggered by leaving the
   tablelist window with mouse button 1 down, in order to avoid any
   conflicts with drag & drop via tkdnd (thanks to Patrick Fradin for
   his valuable contribution).

3. New "isexpanded" subcommand.

4. New value "flat9x6" for the "-arrowstyle" configuration option.

5. Adapted the tree style "oxygen2" to the look of current KDE 4
   versions.

6. Worked around some peculiarities of Tk on Mac OS X Aqua (thanks to
   Torsten Berg for his problem report and discussions on this topic).

7. Improved the check for PNG support in Tk (thanks to Ian Gay for his
   posting on the Wiki related to this subject).

8. Fixed a bug related to the tree style "aqua", introduced in
   Tablelist version 5.3 (thanks to Julian H J Loaring for his bug
   report).

9. Numerous further improvements in the code and documentation.

What was new in Tablelist 5.3.1?
--------------------------------

This release contains just one bug-fix and an enhancement:

1. Fixed a bug related to the "-hide" row configuration option,
   introduced in the previous Tablelist version (thanks to Ralf Fassel
   and Michal Sosnowski for their bug reports).

2. Extended the support for the native "Aqua-blue" background for the
   header label of the sort column (which in the previous Tablelist
   release was restricted to Tk versions 8.6 and above) to the Cocoa-
   based Tk patch levels 8.5.9 and above (thanks to Kevin Walzer for
   discussions on this topic and to Paul Obermeier for enabling me to
   access the ActiveTcl 8.5.8 distribution for the Mac).

What was new in Tablelist 5.3?
------------------------------

1. The interactive row move operation (i.e., local drag & drop) now
   supports moving an item outside its parent and dropping it under
   another item as a child (thanks to Dr. Detlef Groth for his
   proposal, thorough testing, and discussions on this topic).

2. Added the "-acceptchildcommand" configuration option, related to the
   local drag & drop.

3. New "searchcolumn" subcommand, supporting a rich set of options
   (thanks to Matthew Callaghan, Adrian Davis, and Jeff Godfrey for
   their proposals).

4. New "getformatted", "getformattedcolumns", and "getformattedcells"
   subcommands.

5. Support for interactive cell editing with the aid of the Tk core and
   tile menubutton widgets (thanks to Georgios Petasis for his
   proposal).

6. Support for the row indices "top" and "bottom" (thanks to Julian H J
   Loaring and Paul Obermeier for their proposals).  Likewise, support
   for the column indices "left" and "right".

7. New value "photo7x7" for the "-arrowstyle" configuration option,
   needed for the "aqua" theme.

8. Adapted the appearance of tablelist widgets on the Macintosh to
   current versions of OS X Aqua.

9. Numerous further improvements and minor bug fixes.

What was new in Tablelist 5.2?
------------------------------

1.  Added the "-fullseparators" configuration option (thanks to Kevin
    Partin, Martyn Smith, and Harald Oehlmann for their proposals).

2.  Added the tree styles "ambiance", "dust", "dustSand", "newWave",
    "plastik", and "radiance".

3.  The implementation of the "collapse(all)" and "expand(all)"
    subcommands no longer makes use of the "-hide" row configuration
    option, hence you are now free to set the latter (via
    "rowconfigure", "configrowlist", "configrows", or "togglerowhide"),
    regardless of whether the tablelist widget displays a tree
    hierarchy or just a plain list.

4.  The "move" subcommand now supports moving an item outside its
    parent.

5.  Deleting the whole content of a tablelist widget has become
    significantly faster (thanks to Harold Campbell for his input).

6.  Worked around a peculiarity of the text widget related to tag
    handling when deleting a range of lines from its end (thanks to
    Batox for his bug report).

7.  Minor improvements and bug-fixes in the binding scripts (thanks to
    Bernhard Wallner, Batox, and Roger Niva for their bug reports).

8.  Fixed a bug related to the "-selecttype cell" configuration option,
    (re)introduced in Tablelist version 5.0 (thanks to Harold Campbell
    and Dietmar Mueller for their bug reports).

9.  Fixed a bug related to row hiding via "configrowlist" or
    "configrows", introduced in Tablelist version 5.0 (thanks to Michal
    Sosnowski for his bug report).

10. Fixed a long-standing bug related to tooltip support (thanks to
    Trevor Williams for his bug report).

11. Several further improvements and minor bug fixes.

What was new in Tablelist 5.1?
------------------------------

This is a bugfix-only release.  The corrected files in the "scripts"
directory are "tablelistBind.tcl", "tablelistSort.tcl",
"tablelistUtil.tcl", and "tablelistWidget.tcl".

1. Fixed a bug related to item deletion, introduced in the previous
   Tablelist version (thanks to Aric Bills and Roger Niva for their bug
   reports).

2. Fixed a bug related to multi-column sorting, introduced in the
   previous Tablelist version (thanks to Albrecht Mucha for his bug
   report).

3. Fixed a long-standing bug related to column deletion (thanks to
   Liang Sian Yin for his bug report).

4. Fixed a few further minor bugs and typos, introduced in the previous
   Tablelist version (thanks to Patrick Fradin, Roger Niva, Harald
   Oehlmann, and Peter Spjuth for their bug reports).

What was new in Tablelist 5.0?
------------------------------

1.  A tablelist widget is now not only a multi-column listbox, but also
    a multi-column tree widget (thanks to Sebastien Barre, Tillmann
    Basien, Jos Decoster, Dr. Detlef Groth, Kai Morich, Georgios
    Petasis, and Kevin Walzer for their proposals, as well as to Paul
    Obermeier for testing the preliminary version).  This is achieved
    with the aid of the new configuration options "-collapsecommand",
    "-expandcommand", "-treecolumn", and "-treestyle", along with the
    new subcommands "childcount", "childindex", "childkeys", "collapse",
    "collapseall", "depth", "descendantcount", "expand", "expandall",
    "expandedkeys", "insertchild(ren)", "insertchildlist", "noderow",
    "parentkey", and "toplevelkey".

2.  Added the "-editselectedonly" configuration option, related to
    starting the interactive cell editing with mouse button 1 (thanks to
    Julian H J Loaring for discussions on this topic).

3.  New values "flat6x4", "flat9x7", and "flat10x6" for the
    "-arrowstyle" configuration option.

4.  New value "asciinocase" for the "-sortmode" column configuration
    option.

5.  New subcommands "applysorting", "getfullkeys", and "refreshsorting".

6.  Two new demo scripts (and their tile-based counterparts)
    illustrating the use of a tablelist as multi-column tree widget.

7.  The subcommands "insert", "insertlist", "insertchild(ren)", and
    "insertchildlist" now return the list of full keys corresponding to
    the items just inserted.

8.  Fixed a long-standing bug related to the "-labelfont" option (thanks
    to Jacek Jendrysik for his bug report).

9.  Fixed a bug related to the "-text" column configuration option
    (thanks to Paul Obermeier for his bug report).

10. Fixed a long-standing bug related to embedded windows in right-
    aligned columns (thanks to Jerzy Witkowski for his bug report).

11. Numerous further improvements in the code and documentation.

What was new in Tablelist 4.12?
-------------------------------

1.  Added the "labeltag" subcommand and the helper command "tablelist::
    getTablelistColumn", designed to be used in non-default binding
    scripts for the header labels.

2.  Support for interactive cell editing with the aid of the tile
    spinbox widget.  The demo script "tileWidgets.tcl" now uses this
    widget when available.

3.  Support for interactive cell editing with the aid of the new mentry
    widget for IPv6 addresses.

4.  Improved the support for Windows Vista and added explicit support
    for the "vista" theme.

5.  Updated the support for the themes "plastik" and "keramik"; added
    support for the "keramik_alt" theme.

6.  Support for the native "Aqua-blue" background, set for the header
    label of the sort column (thanks to Kevin Walzer for his proposal
    and valuable contribution).  For technical reasons, this feature is
    only supported for Mac-Tk versions using Cocoa.

7.  Further improvements in the support for Mac OS X Aqua (thanks to
    Daniel Steffen and Kevin Walzer for their valuable feedback).

8.  Improvements in the binding scripts related to interactive cell
    editing (thanks to Hadas Porat for discussions on this subject).

9.  The binding for the <Double-Button-1> event in the resize area of a
    column header now works as expected for large lists, too.

10. Eliminated a minor regression related to interactive cell editing,
    introduced in the previous Tablelist version (thanks to Kai Morich
    for his valuable input).

11. Fixed a small bug related to interactive cell editing with the aid
    of a text widget (thanks to Bryan Oakley for his bug report and
    valuable suggestion).

12. Fixed a long-standing bug related to the "-listvariable" option in
    disabled state (thanks to Ralf Fassel for his bug report).

13. Added a version-related hint to the "How to use it?" section of the
    Tablelist Programmer's Guide.

What was new in Tablelist 4.11?
-------------------------------

1.  Added the "-columntitles" configuration option, which is mainly a
    simplified form of the "-columns" option (thanks to Roy Terry for
    his proposal).

2.  Added the virtual events <<TablelistColHiddenStateChanged>> and
    <<TablelistRowHiddenStateChanged>>, generated after toggling the
    hidden state of a column or row, respectively (thanks to Jeff 
    Godfrey for his proposal).

3.  Besides with <Button-3>, the optimal column width can now be set
    with <Double-Button-1> in the resize area of the column's header.
    Similarly, the effect of <Shift-Button-3> can also be achieved with
    <Shift-Double-Button-1> in the column label's resize area.

4.  Support for Windows Vista (thanks to Jeremy Cowgar for his input).

5.  The recommended package name is now "tablelist" rather than
    "Tablelist", for compatibility with the ActiveTcl distribution; the
    demo scripts have been changed accordingly.

6.  Made sure that the "-tooltipdelcommand" configuration option won't
    affect other widgets (thanks to Jeff Godfrey for drawing my
    attention to this issue).

7.  Fixed a long-standing nasty bug related to the "yview" subcommand
    (thanks to Nestor Patino for his bug report and very helpful example
    script).

8.  Fixed two bugs related to the "-listvariable" configuration option
    (again, thanks to Nestor Patino for his valuable input).

9.  Fixed a bug related to the item deletion when using Tcl/Tk 8.5
    (thanks to Jos Decoster and Sven Wuytack for their valuable
    contribution to finding and fixing this bug).

10. Fixed a bug related to the "-windowdestroy" cell configuration
    option, introduced in Tablelist 4.9 (thanks to Sebastien Barre for
    his bug report).

What was new in Tablelist 4.10?
-------------------------------

1.  Support for individual binding scripts controlling the interactive
    cell editing, with the aid of the new "editwintag" subcommand
    (thanks to Oscar Fuentes for his valuable input).

2.  Complemented the "attrib" subcommand with the new subcommands
    "hasattrib" and "unsetattrib".

3.  Support for column-, row-, and cell-specific attributes, with the
    aid of the new subcommands "columnattrib", "hascolumnattrib",
    "unsetcolumnattrib", "rowattrib", "hasrowattrib", "unsetrowattrib",
    "cellattrib", "hascellattrib", and "unsetcellattrib".

4.  Support for interactive cell editing with the aid of the new mentry
    widget of type "DateTime", introduced in version 3.2 of the Mentry
    package (thanks to Florian Murr for his proposal).

5.  Made sure that the default bindings are set up immediately when
    loading the package, prior to creating any tablelist widget (thanks
    to Schelte Bron for his proposal and discussions on this topic).

6.  Re-established the support for tile widgets as edit windows in non-
    tile-based tablelist widgets (again, thanks to Schelte Bron for
    reporting that this was broken in the last few Tablelist versions).

7.  Adapted the handling of the tile checkbutton as edit window in the
    "xpnative" theme to some changes made in tile 0.8 (thanks to Jeff
    Godfrey for his bug report).

8.  Guarded against potential widget deletion from within user-defined
    binding scripts or "update (idletasks)" (thanks to Schelte Bron and
    Jan Kandziora for their bug reports).

9.  Updated the (very rarely needed) distribution file "repair.tcl" to
    work with current Tablelist versions (thanks to Robert Stollf for
    his bug report).

10. Corrected the description of the "-height" option in the reference
    manual (thanks to Glenn Herteg for his bug report concerning the
    case "-height 0").

11. Improved the color handling in the "disabled" state (thanks to Rolf
    Ade for his bug report and discussions on this topic).

12. Made the handling of elided text more robust (thanks to Jos Decoster
    for his bug report and valuable contribution).

13. Several further improvements and minor bug fixes (thanks to Albrecht
    Mucha for his valuable input).

What was new in Tablelist 4.9?
------------------------------

1.  Added the "-wrap" column configuration option, which makes it
    possible to display long texts in word-wrapped multi-line rather
    than snipped form (thanks to Alexander Schoepe and Anant Adke for
    their proposals).  Also, added support for interactive cell editing
    with a word- or char-wrapped text widget when using Tk 8.5 (thanks
    to Juberi Rajib for discussions on this topic).

2.  Support for dynamic-width embedded windows, with the aid of the new
    "-stretchwindow" cell configuration option (thanks to Kurt Kurczyk,
    Bryan Oakley, and Rasmus Debitsch for their proposals). The demo
    script "embeddedWindows.tcl" and its tile-based counterpart now make
    use of this option.

3.  New "formatinfo" subcommand, returning information about the cell
    whose content is being formatted by a command specified as the value
    of the "-formatcommand" column configuration option (thanks to Goran
    Ivankovic and Sebastien Barre for their proposals).

4.  Changed the default value of the "-activestyle" configuration option
    from "underline" to "frame" and that of the "-setfocus" option from
    0 to 1, making them conform to similar changes in Tk 8.5 related to
    the listbox widget.

5.  Improved the appearance of the header labels for the "aqua" theme
    (thanks to Torsten Berg for discussing this topic on the Wiki).

6.  Eliminated the potential invocation of the "unknown" command from
    within the Tablelist code (thanks to Roger Niva for discussions on
    this topic).

7.  When starting the interactive cell editing with the aid of a
    combobox widget, the list associated with the latter is only dropped
    down if the combobox is read-only (thanks to Bryan Oakley for his
    proposal).

8.  The "setThemeDefaults" command no longer throws an error if the
    current theme is not explicitly supported by Tablelist.  Instead, it
    uses the options set by the current theme and falls back to the
    "default" one for the rest (thanks to Schelte Bron for his valuable
    contribution).

9.  Improved the tablelist widget's appearance when the header labels
    are not shown (thanks to Mark Garvey for his input).

10. Fixed two bugs related to the optimized item insertion (thanks to
    Harold Campbell and Bryan Oakley for their bug reports).

11. Fixed a bug related to the "-showlinenumbers" column configuration
    option (thanks to Martin Lemburg for his bug report).

12. Several further improvements and minor bug fixes.

What was new in Tablelist 4.8?
------------------------------

This release fixes a few nasty bugs related to the optimized item
insertion, introduced in the previous Tablelist version (thanks to
Harold Campbell, Roger Niva, and Joerg Klingseisen for their bug
reports).

What was new in Tablelist 4.7?
------------------------------

1.  Significant performance improvements related to the "insert",
    "rowconfigure", "sort", "sortbycolumn", and "sortbycolumnlist"
    subcommands (thanks to Harold Campbell for his valuable
    contribution to speeding up the item insertion).  The extent of the
    speed-up depends on the configuration options present at column,
    row, and cell levels.

2.  Support for cell- and column label-specific balloon help, with the
    aid of the new configuration options "-tooltipaddcommand" and
    "-tooltipdelcommand".

3.  New subcommands "iselemsnipped" and "istitlesnipped", which make it
    very easy to display the full cell texts and column titles as
    tooltips for cells and header labels with snipped contents.

4.  New subcommands "configcolumnlist", "configcolumns",
    "configrowlist", "configrows", "configcelllist", and "configcells",
    which allow you to configure several columns/rows/cells with a
    single command invocation (thanks to Harold Campbell, Jeff Godfrey,
    and Paul Obermeier for their proposals).

5.  Worked around some performance problems regarding the "switch"
    command in Tcl 8.5a6/8.5b1 and ActiveTcl 8.4.14.

6.  Made sure that ActiveState's "style::as" package won't break the
    mousewheel bindings (thanks to Michael Schlenker for drawing my
    attention to this problem).

7.  Improved the focus handling when resizing a column interactively
    (thanks to Jorge Enderr for his bug report).

8.  Corrected a typo in the adaptation of vertical scrolling to the
    text widget changes made in Tk 8.5 (thanks to Julian M Noble for
    his posting on the Wiki related to this subject).

9.  Fixed a bug related to hidden rows when having "-selecttype cell",
    introduced in Tablelist version 4.3 (thanks to Harold Campbell for
    his bug report and discussions on this subject).

10. Fixed a bug in the "cellconfigure" subcommand, introduced in the
    previous Tablelist release (thanks to Roy Terry for reporting this
    problem on the Wiki).

11. Fixed a bug in the "-changesnipside" option (thanks to Kai Morich
    for his bug report).

12. Numerous further improvements in the code and documentation.

What was new in Tablelist 4.6?
------------------------------

1.  Tablelist_tile now supports tile 0.8 and Tk 8.5a6/8.5b1 (where tile
    is integrated in the core).  The new commands "tablelist::setTheme",
    "tablelist::getCurrentTheme", and "tablelist::getThemes" enable you
    to set and get the current theme and to query the available ones,
    without having to worry about the incompatibilities between the
    various tile versions.

2.  New column configuration option "-changesnipside", which allows you
    to override the alignment-specific default snip side (thanks to
    Georgios Petasis for his proposal).

3.  New "columnwidth" subcommand, with the options "-requested",
    "-stretched", and "-total" (thanks to Matthew Callaghan, Richard
    Finstad, Lieven Forrez, and Tom Roeder for their proposals).

4.  Support for the new virtual event <<TablelistColumnResized>>,
    generated after resizing a column interactively (thanks to Kurt
    Kurczyk for his proposal).

5.  Visual improvement:  Within an active row, the gap to the left or
    right of an embedded image or window no longer appears underlined
    (when the "-activestyle" option has its default value "underline").

6.  Embedded images and windows are no longer hidden during interactive
    cell editing (except the editing with the aid of a Tk or tile
    checkbutton widget).

7.  Significantly improved the redraw and stretching behavior when
    resizing a column interactively.

8.  Eliminated some annoying visual effects caused by hidden columns
    when displaying the items of an already visible tablelist widget
    (thanks to Rolf Ade for discussions on this topic).

9.  Adapted the implementation of vertical scrolling to the text widget
    changes made in Tk 8.5 (thanks to Julian M Noble for his posting on
    the Wiki related to this subject).

10. Fixed a bug related to hidden rows, introduced in Tablelist version
    4.3 (thanks to Matthew Callaghan for his bug report).

11. Eliminated the possible endless loop caused by some option database
    settings in the "seecell" subcommand (thanks to Erik Allaert and
    Mauro Comin for reporting this bug).

12. Added a detailed performance-related hint to the description of the
    "-listvariable" configuration option.

13. Numerous further improvements and minor bug fixes.

What was new in Tablelist 4.5?
------------------------------

1.  Static-width columns are now displayed much faster than in earlier
    Tablelist releases.

2.  Quite significantly reduced the performance penalty imposed by
    various column, row, and cell configuration options when sorting,
    redisplaying, moving, or deleting tablelist items.

3.  Embedded images are now handled much more efficiently and are
    displayed much faster than in earlier Tablelist versions.

4.  New column configuration option "-showlinenumbers" (thanks to Rolf
    Schroedter and Sean Xu for their proposals and to Kathrin Klaes for
    testing the implementation).

5.  Support for tile-based multi-entry widgets (introduced in Mentry
    3.0) used as edit windows.

6.  Significantly improved the handling of the <<ThemeChanged>> virtual
    event.

7.  Defined more reasonable windowing system- and theme-specific default
    values for the "-arrowdisabledcolor" option.

8.  Improved and simplified the package loading mechanism (thanks to
    Andreas Kupries for his valuable contribution).

9.  Eliminated the "togglevisibility" subcommand, which was deprecated
    in the previous Tablelist version in favor of "togglecolumnhide".

10. Fixed a bug in the implementation of the "deletecolumns" subcommand,
    introduced in the previous Tablelist release (thanks to Kai Morich,
    Kurt Kurczyk, and Dave Leslie for their bug reports).

11. Fixed two binding-related bugs (thanks to Mark Garvey and Kurt
    Kurczyk for their bug reports).

12. Fixed a bug related to the handling of the "tileqt" theme (thanks to
    Andres Garcia for his bug report).

13. Fixed a small but annoying bug related to the "-maxwidth" column
    configuration option, introduced in the previous Tablelist version.

14. Numerous further improvements and minor bug fixes (thanks to
    Patrick Fradin and Georgios Petasis for their valuable feedback).

What was new in Tablelist 4.4?
------------------------------

1.  New row configuration option "-hide" (thanks to Jeff Godfrey,
    Patrick Fradin. Hemang Lavana, and Martyn Smith for their
    proposals, and especially to Harold Campbell for providing the
    initial implementation and testing the final one.)  For performance
    reasons this option is implemented by using elided text in the
    underlying text widget, and therefore it is not supported for Tk
    versions earlier than 8.3.

2.  New subcommand "togglerowhide" for hiding/unhiding several rows at
    a time (not supported for Tk versions earlier than 8.3).

3.  Renamed the "togglevisibility" subcommand to "togglecolumnhide".
    The old name is still supported, but will be eliminated in the next
    Tablelist release.

4.  New command "tablelist::setThemeDefaults", which can be used to
    make sure that classical Tk widgets, e.g., text, will have a theme-
    specific appearance, just like the tile widgets.  The tile-based
    demo scripts now make use of this command.

5.  When using the "tileqt" theme, the version number of TileQt must be
    0.3 or higher (thanks to Georgios Petasis for providing the new
    "tileqt" features used in this Tablelist release).

6.  For Tk 8.3 or later, hidden columns are now handled by using elided
    text, which results in very significant performance improvements
    (thanks to Harold Campbell for his valuable contribution).

7.  Improved the handling of the "-listvariable" option in connection
    with snit widgetadaptors (thanks to Rolf Ade for his bug-fix).

8.  Corrected a typo in the implementation of the "move" subcommand,
    introduced in the previous release (thanks to Jerome Siot for his
    bug report).

9.  Improved the handling of the virtual event <<ThemeChanged>> (thanks
    to Wofgang Grosser for his bug report).

10. Fixed a long-standing bug related to hidden columns (thanks to Dave
    Leslie for his bug report).

11. Worked around a peculiarity of the "place" command on Windows,
    which caused refresh problems in column labels with images (thanks
    to Sebastien Barre for his bug report).

12. Numerous further improvements and minor bug fixes.

What was new in Tablelist 4.3?
------------------------------

1. Support for multi-line cells:  Newline characters now force line
   breaks when displaying the items (thanks to Sebastien Barre,
   Tillmann Basien, Cameron Laird, Kai Morich, and Vaclav Snajdr for
   their proposals).  In addition, interactive cell editing can now
   take place with the aid of a text widget, too (this has caused a few
   minor changes in the default key bindings for the edit window).

2. Support for multi-column sorting with the aid of the new subcommands
   "sortbycolumnlist", "sortcolumnlist", and "sortorderlist", as well
   as of the new command "tablelist::addToSortColumns".  The latter is
   designed to be specified as the value of the new widget and column
   configuration option "-labelcommand2", whose value is invoked on 
   <Shift-Button-1> events.  Multi-column sorting is visualized by
   means of multiple sort arrows, which are displayed together with the
   corresponding sort ranks.  (Thanks to Harold Campbell for proposing
   most of these features, providing the initial implementation, and
   testing the final one.)

3. New configuration option "-setfocus", specifying whether mouse
   button 1 should set the focus to the tablelist's body (thanks to
   Tillmann Basien for discussions on this topic).

4. Replaced the contents of the directory "images" with a script file
   containing procedures that create the bitmap images from inline data
   (thanks to Mats Bengtsson, Patrick Fradin, and Kai Morich for their
   proposals).

5. Fixed a bug related to the use of a tile entry within a non-tile-
   based tablelist widget on Windows XP (thanks to Schelte Bron for his
   bug report).

6. The handling of <Command-Key> events during interactive cell editing
   is now explicitly restricted to Mac OS Classic and Mac OS X Aqua,
   because, strangely enough, on Windows these events are generated by
   simple keypresses if Num Lock is active.

7. Numerous further code improvements, minor bug-fixes, and support for
   several recent changes in tile.

8. Cleaned up the documentation, to make sure that the HTML files
   generated for the ActiveTcl distribution with the tool HTML Tidy
   will be syntactically identical to the original ones.

What was new in Tablelist 4.2?
------------------------------

1.  The resize area of the header labels now consists of a few pixels
    on both sides of the right edge (thanks to Bryan Oakley for
    suggesting this improvement).

2.  Made sure that the header labels have the right appearance in the
    "aqua" theme when using tile version 0.6.4 or later (thanks to
    Bryan Oakley for his bug report).

3.  Several further improvements related to Mac OS X Aqua (for example,
    support for the "Command" key during keyboard navigation between
    the editable cells).

4.  Fixed a very long-standing bug in the "containing" subcommand
    (thanks to Mats Bengtsson, Schelte Bron, and Mark Garvey for their
    bug reports).

5.  Fixed a bug related to the "xpnative" theme, introduced in the
    previous release (thanks to Mark Garvey, Jeff Godfrey, and Uwe
    Koloska for their bug reports).

6.  Fixed another very long-standing bug, related to insertion and
    deletion of columns having images in their labels (thanks to
    Sebastien Barre for his bug report).

7.  Fixed an old bug related to embedding images or windows into hidden
    cells (again, thanks to Sebastien Barre for reporting this bug).

8.  The demo scripts now work independently of their location (this
    small improvement reflects the fact that Tablelist is now included
    in tklib, where the examples are in a location different from
    "$tablelist::library/demos").

9.  Adapted two tile-based demo scripts to the recently released tile
    version 0.7.

10. Several further improvements in the code and documentation (thanks
    to Patrick Fradin for his valuable contribution).

What was new in Tablelist 4.1?
------------------------------

1.  Significantly extended the tile support in the Tablelist_tile
    package:  Header labels now look and behave like the column
    headings of treeview widgets, and over a dozen configuration
    options have theme-specific default values (thanks to Paul
    Obermeier for his excellent "poImgview" application, which helped
    me a lot during this work, as well as to Georgios Petasis for his
    Qt-related hints).

2.  Header labels containing the mouse cursor are now set into active
    state.  Their appearance is controlled in the Tablelist package by
    the new configuration options "-labelactivebackground" and
    "-labelactiveforeground", while the Tablelist_tile package uses
    theme-specific background and foreground colors for the active and
    pressed states of the labels.

3.  New configuration option "-arrowstyle", specifying the flat or
    sunken relief and the dimensions of the arrow indicating the
    sorting order.  This option has windowing system- and theme-
    specific default values.

4.  New configuration option "-protecttitlecolumns", used to protect
    the title column boundary from being crossed when moving a column
    interactively (thanks to Schelte Bron for his proposal).

5.  New configuration option "-spacing", specifying additional space to
    provide above and below each tablelist row (thanks to Sebastien
    Barre for his proposal).

6.  New column configuration option "-stretchable", complementing the
    global "-stretch" option (thanks to Sebastien Barre for his
    proposal).

7.  New row configuration option "-name", whose value can also be used
    as a row index and as the first component of a cell index (thanks
    to John Kozura for his proposal).

8.  New cell configuration option "-windowdestroy", specifying a script
    to be invoked when a window embedded into the cell is destroyed
    (thanks to Sebastien Barre for his proposal).

9.  New "imagelabelpath" subcommand (thanks to Schelte Bron for his
    proposal).

10. Keyboard navigation during interactive cell editing now works on
    Mac OS X Aqua, too.

11. Restored the support for Tcl/Tk versions earlier than 8.3, by
    cleaning up the handling of the "-titlecolumns" option (thanks to
    Andreas Flach and Brian O'Hagan for their bug reports).

12. Restored the support for Tcl/Tk versions earlier than 8.0.4, which
    has been broken since release 3.5, due to the use of the
    <MouseWheel> event, introduced in Tk 8.0.4 (thanks to Brian O'Hagan
    for his valuable contribution).

13. Worked around a peculiarity of the text widget's "dump -window"
    command (thanks to Greg Reynolds for his bug-fix).

14. Fixed a binding-related bug in "extended" selection mode (thanks to
    David Mattinson for his bug-fix).

15. Numerous further improvements and minor bug fixes (thanks to
    Schelte Bron, Patrick Fradin, Silas Justiniano, and Uwe Koloska for
    their bug reports and valuable contributions).

What was new in Tablelist 4.0?
------------------------------

1.  Support for the tile entry, combobox, and checkbutton widgets for
    interactive cell editing (thanks to Miguel Bagnon, Andy Black,
    Adrian Chan, and Mark Garvey for their proposals and to Mats
    Bengtsson and Kevin Walzer for their support on the Macintosh).
    See the new reference page "tablelistTile.html" for details.

2.  Support for tile-compatibility:  By just specifying "package
    require Tablelist_tile" instead of "package require Tablelist", the
    tablelist widgets will have a modern theme-specific appearance
    (again, thanks to the above-mentioned Tablelist users for their
    suggestions and assistance).  See the "How to use it?" and "More on
    Tablelist_tile" sections of the tutorial "tablelist.html" for
    details.

3.  New demo script "tileWidgets.tcl", illustrating the use of tile
    widgets for interactive cell editing and of the Tablelist_tile
    package.  All the other demo scripts are now provided in both a
    traditional and a tile-based version.  See the "Tile-based demo
    scripts" section of the tutorial "tablelist.html" for an example
    and some screenshots.

4.  The Tk checkbutton used for interactive cell editing is now a
    platform-specific checkbutton widget on Windows and the Macintosh
    (thanks to Mats Bengtsson for his help related to the Macintosh
    platform).

5.  The "-editwindow" option is now available at cell level, too
    (thanks to Kenneth Green for his proposal).

6.  New subcommand "togglevisibility" for hiding/unhiding several
    columns at a time (thanks to Stefan Finzel and Kai Morich for their
    proposals).

7.  Support for the new virtual event <<TablelistSelectionLost>>,
    generated when a tablelist widget having "-exportselection 1" loses
    the selection (thanks to Aldo Buratti for his proposal).

8.  After sorting the items, the "most important" row is automatically
    brought into view (thanks to Kai Morich for his valuable input).

9.  Worked around a peculiarity of Tk for Windows, related to mouse
    events (thanks to Tore Morkemo and Mike Collins for their bug
    reports).

10. Worked around a problem related to the visibility of the up/down-
    arrow on Mac OS X Aqua (thanks to Kevin Walzer for his bug report).

11. Fixed a bug in the "seecell" subcommand, introduced in Tablelist
    version 3.7 (thanks to Stefan Finzel for his bug report).

12. Fixed a bug in the "rowconfigure" subcommand, introduced in the
    previous Tablelist release (thanks to Tore Morkemo for his bug
    report).

13. Eliminated the memory leak caused by incomplete cleanup on deleting
    rows with embedded windows (thanks to David Cockerell for his bug
    report).

14. Fixed a small timing-related bug in the "editcell" subcommand
    (thanks to Kenneth Green for his bug report).

15. Numerous further improvements and minor bug fixes (thanks to Greg
    Reynolds for his valuable input).

What was new in Tablelist 3.8?
------------------------------

1. New configuration option "-forceeditendcommand", controlling the
   invocation of the script corresponding to the value of the
   "-editendcommand" option (thanks to Nestor Patino for his proposal).
 
2. New subcommands "getcells" and "windowpath" (thanks to Jeff Godfrey
   and Mike Collins for their proposals).

3. Support for the new virtual event <<TablelistCellRestored>>,
   generated by the "cancelediting" subcommand.

4. Significantly improved the performance of the "delete",
   "deletecolumns", and "movecolumn" subcommands for tablelist widgets
   having color or font options set at column, row, or cell level
   (thanks to Michael Bahr for his valuable feedback).

5. Improved the autoscrolling with the left mouse button in both the
   body and the header of a tablelist widget having title columns.

6. Fixed a bug related to the "-titlecolumns" option, introduced in the
   previous Tablelist release (thanks to Alexander Schoepe for his bug
   report).

7. Fixed a typo in the implementation of the "seecell" subcommand,
   introduced in the previous Tablelist release (thanks to Patrick
   Fradin for his bug report).

8. Improved the demo script "embeddedWindows.tcl" (thanks to Patrick
   Fradin for his valuable input).

9. Several further improvements and minor bug fixes.

What was new in Tablelist 3.7?
------------------------------

1. New configuration option "-titlecolumns", specifying the number of
   the non-scrollable columns at the left edge of the window (thanks to
   Goran Ivankovic, Paul Kienzle, Hemang Lavana, and Takeshi Sakamoto
   for their proposals).  For technical reasons (the use of the
   "-elide" option for a text widget tag), this option is not supported
   for Tk versions earlier than 8.3.

2. Extended the "separatorpath" and "separators" subcommands, to
   support the new special separator, which is displayed to mark the
   end of the title columns, independently of the value of the
   "-showseparators" option.

3. The "-stripebackground" and "-stripeforeground" options now have a
   higher priority than the "-background" and "-foreground" column
   configuration options, respectively (see the demo script
   "styles.tcl", which has been extended to illustrate this change).

4. Improved the handling of embedded images with transparent
   background, complementing the changes made in the previous Tablelist
   release (thanks to Kai Morich for his valuable contribution).

5. Improved the implementation of the "seecell" subcommand for centered
   and right-aligned columns.

6. Fixed two bugs related to the "rowconfigure" subcommand, introduced
   in Tablelist version 3.5 (thanks to Ted Branscomb and Roger Niva for
   their bug reports).

7. Fixed an old bug related to the "movecolumn" subcommand.

8. Several further improvements and minor bug fixes.

What was new in Tablelist 3.6?
------------------------------

1.  Support for embedded windows, with the aid of the new cell
    configuration option "-window" (thanks to Wolf Grossi, Glenn
    Herteg, Takeshi Sakamoto, and Keesang Song for proposing this
    option).

2.  New demo script "embeddedWindows.tcl" illustrating the use of
    embedded windows in tablelist widgets; this is discussed in a new
    section of the tutorial "tablelist.html".

3.  Significantly improved and optimized the handling of embedded
    images.

4.  Simplified the support for user-defined binding scripts with the
    aid of the new commands "tablelist::getTablelistPath" and
    "tablelist::convEventFields", as well as of a new binding tag whose
    name is returned by the new "bodytag" subcommand (which is now used
    in the demo script "browse.tcl").

5.  Support for the new virtual events <<TablelistRowMoved>>,
    <<TablelistColumnMoved>>, <<TablelistColumnSorted>> and
    <<TablelistCellUpdated>> (thanks to John Vidolich for his
    proposal).  In addition, the new virtual event <<TablelistSelect>>
    can now be used instead of <<ListboxSelect>> (which is supported
    for compatibility reasons).

6.  New subcommand "itemlistvar", for accessing the tablelist widget's
    internal list (thanks to Patrick Fradin for his valuable input).

7.  Fixed a bug related to the "-listvariable" option, introduced in
    the previous Tablelist release (thanks to Torsten Reincke for his
    bug report).

8.  Fixed two bugs related to the "cellselection" subcommand (thanks to
    John Vidolich for his bug report).

9.  Fixed a few typos and minor bugs in the default binding scripts
    (thanks to Patrick Fradin, Tore Morkemo, and Torsten Reincke for
    their bug reports).

10. Numerous further improvements and minor bug fixes.

What was new in Tablelist 3.5?
------------------------------

1.  New configuration option "-selecttype" with the values "row" and
    "cell", and new binding scripts supporting these two selection
    types (thanks to Kevin Partin for his proposal and to Dietmar
    Mueller for his valuable contribution).

2.  New subcommands "activatecell", "cellselection", and
    "curcellselection", used in the binding scripts mentioned above.

3.  The words "active" and "anchor" are now recognized as valid column
    and cell indices, too.

4.  New configuration options "-movablerows" and "-movecursor", and new
    mouse bindings for moving a row interactively (thanks to Dan Rogahn
    for his valuable contribution).

5.  The key sequences used for navigation between the editable cells
    now also move the active item or element and change the
    (cell)selection and the (cell)selection anchor in the body of the
    tablelist widget.

6.  Improved the handling and appearance of the checkbutton widget when
    used as edit window (thanks to Kevin Partin for reporting a problem
    experienced when the tablelist is embedded into an Iwidgets
    dialogshell).

7.  The "-listvariable" option now supports variable names returned by
    the "itcl::scope" command, too (thanks to Nicolae Mihalache for his
    bug report).

8.  Fixed a very long-standing bug related to horizontal scrolling when
    using a non-default font (thanks to Brand Hilton for his bug report
    and fix).

9.  Fixed another very long-standing bug, related to list variables
    (thanks to Dr. Detlef Groth and John R. Smith for their bug
    reports).

10. Numerous further improvements and minor bug fixes (thanks to
    Patrick Fradin for his valuable input).

What was new in Tablelist 3.4?
------------------------------

1.  New column configuration option "-editwindow", specifying the
    widget type used for interactive cell editing in the respective
    column (thanks to Damon Courtney, Patrick Fradin, and Keesang Song
    for their proposals and to Mats Bengtsson and Benny Riefenstein for
    their help related to the Macintosh platform).  The edit window may
    be a Tk core entry, spinbox, or checkbutton, or one of the 16
    supported widgets from the packages BWidget, Iwidgets, combobox (by
    Bryan Oakley), and Mentry.

2.  New subcommand "editwinpath".

3.  Three new demo scripts illustrating the use of the "-editwindow"
    option; these are discussed in a new section of the tutorial
    "tablelist.html".

4.  New column configuration option "-maxwidth" (thanks to Tore Morkemo
    for his proposal).

5.  The <Shift-Button-3> event in a column label now restores the
    column's last static width (thanks to Dietmar Mueller for his
    valuable input).

6.  Changing a tablelist's font now updates the column widths
    accordingly.

7.  Improved the handling of the "-setgrid" option.

8.  Improved the error handling related to the option database in the
    general mega-widget utility module "mwutil.tcl".

9.  Fixed a minor bug in the "containingcolumn" subcommand (thanks to
    David Mattinson for his bug report).

10. Restored the support for Tcl/Tk versions earlier than 8.0.4, which
    has been broken since release 3.0, due to the use of the
    <MouseWheel> event, introduced in Tk 8.0.4.

11. Further code improvements (thanks to Patrick Fradin for his
    valuable input).

12. Many improvements in the documentation, including a new Quick
    Reference section (thanks to Dietmar Mueller for his valuable
    contribution).

What was new in Tablelist 3.3?
------------------------------

1. New column configuration option "-text" (thanks to Paul Kienzle for
   his proposal).

2. New subcommands "containing", "containingcolumn", "containingcell",
   and "fillcolumn".

3. New subcommands "deletecolumns", "insertcolumns", and
   "insertcolumnlist" (thanks to Kevin Partin and Paul Kienzle for
   their proposals).

4. Renamed the subcommands "getcolumn" and "getkey" to "getcolumns" and
   "getkeys", respectively.  (This won't break any existing scripts,
   because the old command names are abbreviations of the new ones.)

5. Restored the support for Tcl/Tk versions earlier than 8.4, which was
   broken in Tablelist 3.1 and 3.2, due to the use of the improved
   syntax of the "place configure" command, introduced in Tk 8.4
   (thanks to David Mattinson, Kurt Braganza, and Alexander Baath for
   reporting this problem).

6. Fixed a bug in the "editcell" subcommand, introduced in Tablelist
   3.1 (thanks to Damon Courtney for his bug report).

7. Improved the demo script "config.tcl" (thanks to Mats Bengtsson for
   his input).

8. Restructured the code by moving several procedures from the
   distribution file "tablelistWidget.tcl" into smaller, more
   manageable modules.

9. Numerous further improvements and minor bug fixes.

What was new in Tablelist 3.2?
------------------------------

1. The key associated with a tablelist item can now be used as a row
   index and as the first component of a cell index of the form
   "row,col".

2. The "delete", "get", "getcolumn", "getkey", "selection clear", and
   "selection set" subcommands now also accept a list of indices as
   single argument (thanks to Damon Courtney and Erik Leunissen for
   their proposals).

3. Made the interactive "movecolumn" operation more intuitive and
   compatible with the behavior exhibited by similar actions in popular
   applications on various platforms (thanks to Paul Kienzle for his
   suggestion).  For example, the target position of the column being
   moved is now indicated by a temporary gap displayed in the
   tablelist's header.

4. New configuration option "-targetcolor", used to set the color of
   the gap mentioned above.

5. Fixed a bug related to the <MouseWheel> event, caused by a missing
   close-bracket in the last release (thanks to Patrick Fradin for his
   bug report).

6. Fixed a bug that raised an error in the "movecolumn" command for an
   empty tablelist widget (thanks to Paul Kienzle for his bug report).

7. The workaround in the "xview" and "yview" subcommands for a Tk bug
   under Mac OS X Aqua is now only activated for that windowing system,
   since (as reported by Patrick Fradin) it caused problems on some
   other systems.

8. Further minor code improvements.

What was new in Tablelist 3.1?
------------------------------

1.  New configuration options "-movablecolumns" and
    "-movecolumncursor".

2.  New column configuration option "-name", whose value can also be
    used as a column index and as the second component of a cell index
    of the form "row,col".

3.  New subcommands "move", "movecolumn", "getcolumn", "getkey", and
    "finishediting" (thanks to Damon Courtney, Daniel Fehrenbach, Jeff
    Godfrey, and Kevin Partin for their proposals).

4.  Extended the scope of the "cancelediting" subcommand.

5.  New mouse bindings for moving a column interactively.

6.  The autoscrolling, as described in the "DEFAULT BINDINGS" section
    of the "listbox" manual entry, is now implemented for the header of
    a tablelist widget, too.

7.  The interactive cell editing is now finished by any mouse click in
    the tablelist's body, outside the cell just being edited (thanks to
    Patrick Fradin and Jeff Godfrey for this suggestion).

8.  The value returned by the "selection includes" command no longer
    depends on the tablelist's state.

9.  Worked around a bug in Tk 8.4.0 and 8.4.1 related to the "selection
    handle" command, which caused crashes under KDE 3.0 (thanks to
    Andres Garcia for reporting this and to Joe English for suggesting
    the workaround and fixing the bug in Tk 8.4.2).

10. Improved the support of Mac OS X Aqua and Mac OS Classic (thanks to
    Mats Bengtsson, Raymond Calande, Techin Alex Kang, Bernhard
    Spinnler, and especially to Benny Riefenstein for their valuable
    contributions).

11. Fixed a bug related to the invocation of the "cellconfigure"
    subcommand from within a pre-edit callback (thanks to Dr. Johannes-
    Heinrich Vogeler for his bug report).

12. Several performance improvements (thanks to Patrick Fradin for his
    valuable suggestions).

13. Improved the platform-specific stuff in the demo scripts
    "config.tcl" and "browse.tcl".

14. Numerous further improvements in the code and documentation.

What was new in Tablelist 3.0?
------------------------------

The main new feature provided by this release is the support for
interactive cell editing (thanks to Juri Shimon, Dr. Johannes-Heinrich
Vogeler, and Jeff Godfrey for their proposal).  The first three items
below are related to this subject:

1. New configuration options "-editstartcommand" and "-editendcommand".

2. New column and cell configuration option "-editable".

3. New subcommands "editcell", "entrypath", "cancelediting", and
   "rejectinput".

Further changes:

4. New subcommands "seecolumn" and "seecell".

5. Tabulator and newline characters are now retained in the internal
   list, displayed as "\t" and "\n", and supported by interactive cell
   editing (thanks to Jacek Jenrysik for his query concerning multi-
   line items).

6. The redisplay and sorting of tablelist items have become
   dramatically faster (thanks to Matt Becker for his input that
   determined me to optimize these operations, and also for his
   testing).

7. Further performance improvements (thanks to Patrick Fradin for his
   valuable contribution).

8. The option values displayed by the demo script "config.tcl" can now
   be edited interactively.

9. Minor improvements in the code and documentation.

What was new in Tablelist 2.8?
------------------------------

1. The trailing or leading ellipsis ("...") used when displaying the
   elements that don't fit into their cells can now be replaced with an
   arbitrary string specified with the aid of the new "-snipstring"
   configuration option (thanks to Tore Morkemo for his proposal).

2. New value "none" for the "-activestyle" configuration option.

3. When exporting the selection, the elements of the hidden columns are
   now skipped and the contents of the visible cells are transformed
   according to the value of the "-formatcommand" option for the
   corresponding columns.

4. Improved and simplified the focus control (thanks to Juri Shimon and
   Gopal Reddy for their bug reports).

5. Further minor code improvements.

What was new in Tablelist 2.7?
------------------------------

1. Increased the speed of the "insert" and "insertlist" subcommands as
   well as that of item insertions with the aid of the "-listvariable"
   option by a factor of about 1.3.  The "insert" subcommand is now
   about 2.3 times faster than in version 2.4.  Compared to version
   2.4, item insertion with the aid of the "-listvariable" option has
   become more than 10 times faster.

2. The number of pixels by which a column is stretched is now
   proportional to its width in pixels.  Based on this change,
   significantly improved the stretching behavior after an interactive
   column resize operation (thanks to Mats Bengtsson for his valuable
   suggestions).

3. Fixed a bug in the "-(label)font" and "-labelborderwidth"
   configuration options, introduced in version 2.5 (thanks to Bastien
   Chevreux for his bug report).

4. Fixed a bug in the "columncget", "rowcget", and "cellcget"
   subcommands, introduced in version 2.3 (again, thanks to Bastien
   Chevreux for reporting this bug).

5. Fixed a bug in the binding scripts for the binding tag
   "TablelistBody" (thanks to Miguel Bagnon for his bug report).

6. Applied a patch proposed by Jeff Adamczak that works around a bug in
   the "lsort" command, present in Tcl versions 8.0 - 8.3.2.

7. Applied a patch proposed (in a slightly different form) by Mats
   Bengtsson that works around a bug in the "info script" command on
   the Macintosh.

8. Further minor code improvements.

What was new in Tablelist 2.6?
------------------------------

The only change in this version is a bug-fix eliminating a rather nasty
bug in the "insert" and "insertlist" subcommands, introduced in the
previous release.  Thanks to Mats Bengtsson for his bug report and to
Jeffrey Hobbs for suggesting me to bump the version number to 2.6.

What was new in Tablelist 2.5?
------------------------------

1. Increased the speed of the "insert" subcommand by a factor of about
   1.8 and that of item insertions with the aid of the "-listvariable"
   option by a factor of about 8.  (These figures are based on speed
   measurements made with two tablelist widgets: one having 1000 rows
   and 10 columns and another one with 5000 rows and 20 columns.)

2. The "delete", "sort", and "sortbycolumn" subcommands, as well as row
   and cell updates with the aid of the "rowconfigure" and
   "cellconfigure" operations have also become significantly faster.

3. New "insertlist" subcommand.

4. New "-stripeheight" configuration option (thanks to Gregory Samoluk
   for his proposal).

5. If no columns are to be stretched then the blank space following the
   header labels is now filled with a dummy, insensitive label having
   the same background, borderwidth, and relief as the "normal" header
   labels.

6. Fixed a bug concerning the placement of the arrow indicating the
   sorting order (thanks to Robert Minichino for his bug report).

7. Improved the handling of header labels with embedded images, to
   eliminate some peculiarities experienced on Windows.

8. Several further improvements and minor bug fixes.

What was new in Tablelist 2.4?
------------------------------

1. New column configuration option "-formatcommand" (thanks to Jeff
   Godfrey for his proposal).  This option is now used in the demo
   script "browse.tcl".

2. New row configuration option "-selectable" (thanks to Tore Morkemo
   for this proposal).

3. Significantly improved the performance of the row and cell updates,
   as well as of the "delete" subcommand (thanks to Emanuele Lupi for
   her input that determined me to optimize these operations).

4. The widget implementation is now fully compatible with the recent
   changes made in Tk 8.4a4 (thanks to Patrick Fradin for his input).

5. Pop-up menus as children of a tablelist widget cause no problem any
   longer (thanks to Andres Garcia and Bastien Chevreux for reporting
   this bug, introduced in the previous release).

6. Fixed a bug caused by the delayed redisplay after changing the
   number of columns (thanks to Tore Morkemo for his bug report).

7. Minor improvements in the code and documentation.

What was new in Tablelist 2.3?
------------------------------

1. New configuration option "-activestyle", enabling to surround the
   active item with a frame instead of underlining it.

2. The columns can now be separated with borders, by making use of the
   new configuration option "-showseparators".

3. A nice distinguishing effect for the rows can now be obtained with
   the aid of the new configuration options "-stripebackground" and
   "-stripeforeground".

4. New tablelist widget subcommands "separatorpath" and "separators".

5. Fixed a bug related to the column index if the header labels are
   hidden (thanks to Emanuele Lupi for her bug report).

6. New demo script "styles.tcl", showing several ways to improve the
   appearance of a tablelist widget.

7. The demo scripts "config.tcl" and "browse.tcl" now make use of the
   new "-stripebackground" option.

8. Numerous further improvements and minor bug fixes (thanks to Patrick
   Fradin for his valuable input).

What was new in Tablelist 2.2?
------------------------------

1. The "-font" configuration option can now be specified at column,
   row, and cell level, too (this was proposed and partly implemented
   by Patrick Fradin).  The data will be aligned properly, no matter if
   the fonts are of different sizes.

2. Significantly improved the performance of the Tcl command associated
   with a tablelist widget, especially that of the "delete", "sort",
   and "sortbycolumn" subcommands for a large number (i.e., several
   thousands) of items.

3. Corrected the creation of the arrow indicating the sorting order, to
   make sure that it works under all supported Tcl/Tk versions (thanks
   to Juri Shimon and Andres Garcia for their bug reports).

4. Several improvements in the demo scripts "config.tcl" and
   "browse.tcl".  Among others, the GUIs generated by these scripts now
   have a better platform-specific look & feel (many thanks to Mats
   Bengtsson for his valuable suggestions concerning the Macintosh
   platform).

5. Further minor improvements in the code.

What was new in Tablelist 2.1?
------------------------------

1. The up- or down-arrow indicating the sorting order now has a 3-D
   border, giving the arrow a sunken relief.

2. Due to the new 3-D look of the arrow, the default values of the
   "-arrowcolor" and "-arrowdisabledcolor" configuration options have
   been changed to an empty string, indicating that the arrow will
   inherit the background color of the label in which it is placed.

3. Several improvements in the demo script "browse.tcl".

4. Minor improvements in the code and documentation.

5. The distribution file "tablelist2_1.zip" for Windows now includes
   the "tablelist2.1" directory, hence it is no longer necessary to
   create this folder before unpacking the distribution file (thanks to
   Kevin Partin for this suggestion).

What was new in Tablelist 2.0?
------------------------------

1.  New cell configuration option "-image", used to set and retrieve
    the image to be displayed (by itself or together with a text) in a
    cell of a tablelist widget.

2.  New column configuration option "-labelimage" specifying the image
    to be displayed (by itself or combined with a text) in a column
    label.

3.  The alignment of a header label can now be defined to be different
    from that of the elements contained in its column, by using the new
    column configuration option "-labelalign".

4.  Renamed the column configuration option "-justify" to "-align",
    because (at least in the case of the header labels) this actually
    specifies not only the justification, but also the anchor point.
    Hopefully, this POTENTIAL INCOMPATIBILITY will not break too many
    existing applications, because the column alignments are usually
    specified within the "-columns" global option.

5.  Fixed a bug that raised an error when some configuration options
    were specified at widget creation time before the "-columns" option
    (thanks to Bastien Chevreux for his bug report).

6.  Reverted the implementation of the focus control to that contained
    in the pre-1.6 Tablelist releases, because its simplified version
    from the last release failed to work as expected if a tablelist was
    the only widget taking the focus during keyboard traversal (thanks
    to Juri Shimon for his bug report).

7.  Fixed a bug that caused an erronous return value of the "labels"
    subcommand if the arrow indicating the sorting order was displayed.

8.  Several performance improvements, kindly contributed by Patrick
    Fradin.

9.  To improve the performance even further, the invocations of "info
    exists" for array elements are no longer replaced with a call to a
    helper procedure (introduced in Tablelist 1.2), because the Tcl bug
    that made this necessary for Tcl versions 8.2, 8.3.0 - 8.3.2, and
    8.4a1 was fixed in Tcl 8.3.3 and 8.4a2.  If for some reason you
    cannot upgrade your Tcl/Tk version, then you should patch the file
    "tablelistWidget.tcl" with the aid of the script "repair.tcl", as
    described in the files "README.txt" and "tablelist.html".

10. The demo script "browse.tcl" now inserts an image into the first
    cell of each row of the tablelist widget.

11. Numerous further improvements and minor bug fixes.

What was new in Tablelist 1.6?
------------------------------

1. The value of the "-stretch" configuration option is now ignored if
   the width of the tablelist widget was specified as zero or less.
   This change was necessary in order to improve the behavior of
   dynamic-width tablelist widgets with the "-setgrid" option set to
   true.

2. By pressing mouse button 1 over a header label, the label's relief
   is now only changed to "sunken" if the value of the global or
   column-specific "-labelcommand" option is nonempty.

3. Several improvements concerning hidden columns (thanks to Juri
   Shimon for his bug report).

4. Made the focus control more straight-forward.

5. Extended the "How to use it?" section of the tutorial
   "tablelist.html".

What was new in Tablelist 1.5?
------------------------------

This version contains mainly bug fixes and small improvements.  Many
thanks to Andres Garcia, Bastien Chevreux, and Patrick Fradin for their
valuable contributions.

1. Fixed a bug concerning the "-label*" configuration options.

2. Fixed the erronous invocation of "getSubCmd" in the selection
   handler "fetchSelection" (this bug was introduced in version 1.1).

3. Elements that don't fit into their cells are now displayed with a
   trailing or leading ellipsis ("..."), depending on the column
   alignment.

4. Several further improvements and minor bug fixes.

What was new in Tablelist 1.4?
------------------------------

1. New "-stretch" configuration option specifying the columns that are
   to be stretched in order to eliminate the blank space that might
   appear at the right of the table.

2. Improved the error handling in the "attrib", "configure",
   "columnconfigure", "rowconfigure", and "cellconfigure" subcommands.

3. Improved the demo scripts "browse.tcl" and "config.tcl".

What was new in Tablelist 1.3?
------------------------------

1. The "sortbycolumn" subcommand now per default places an up- or
   down-arrow indicating the sorting order into the respective column's
   label.  This can be enabled or disabled with the new "-showarrow"
   configuration option, at both widget and column level.

2. New configuration options "-arrowcolor", "-arrowdisabledcolor", and
   "-incrarrowtype" to control the appearance of the arrow mentioned
   above.

3. New "resetsortinfo" subcommand, used to reset the information about
   the sorting of the items.

4. Improved the demo script "browse.tcl".

5. Further improvements in the code and documentation.

What was new in Tablelist 1.2?
------------------------------

1. Whereever possible, eliminated the invocations of "info exists" for
   array elements.  This works around a severe bug in Tcl versions 8.2
   and 8.3 (fixed in 8.4a2), which causes excessive memory use when
   calling "info exists" on a non-existent array element.  Some serious
   memory leaks in earlier Tablelist versions when run under Tcl/Tk 8.2
   or 8.3 (reported by Henning Hanusa and Christian Burrini) could be
   tracked down to this very annoying Tcl bug (which I was not aware of
   until recently).

2. The help variables used in the initialization of the "tablelist"
   namespace are now declared with the "variable" keyword, in order to
   avoid any conflicts with global variables.

3. Improved the parsing of configuration and command options.

What was new in Tablelist 1.1?
------------------------------

This version contains mainly bug fixes and small improvements.  Many
thanks to Patrick Fradin, Bastien Chevreux, and Mats Bengtsson for
their valuable contributions.

1. Fixed some bugs in the implementation of the "-listvariable" option.
   Also, the value of this option can now be an array element, not only
   a scalar variable.

2. Fixed a bug in the implementation of the "get" subcommand.

3. New "sortcolumn" and "sortorder" subcommands to query the arguments
   of the last sorting.

4. Improved the look & feel of tablelist widgets on the Macintosh.

5. Worked around a bug in Tk 8.3.0 (fixed in 8.3.1) concerning listbox
   widgets with configured "-cursor" option.

6. Several further improvements and minor bug fixes.

What was new in Tablelist 1.0?
------------------------------

1.  New "-resizable" option for the "columnconfigure" subcommand.

2.  New "labels" subcommand, returning the list of the header labels.

3.  The "-disabledforeground" and "-state" configuration options no
    longer require Tk version 8.3 or higher.

4.  All "-label*" column configuration options can now have an empty
    string as value, meaning that the corresponding global option will
    be used instead of the column-specific one.

5.  Improved the output of the "columnconfigure" subcommand.

6.  The help variables used in the coordinate transformations within
    the scripts defined for the "TablelistBody" binding tag have been
    moved into the "tablelist" namespace, in order to avoid any
    conflicts with global variables.

7.  Improved cross-platform support with the aid of the new <<Button3>>
    virtual event.

8.  Fixed a bug in the "compareAsSet" procedure of the demo script
    "config.tcl".

9.  New demo script "browse.tcl", containing a simple widget browser
    based on a tablelist.

10. Both demo scripts now use a namespace for their procedures, to
    avoid any conflicts when evaluating them with the "source" command.

11. The tutorial "tablelist.html" is now completed and includes a
    detailed discussion of both demo scripts mentioned above.

12. Numerous further improvements in the code and documentation.

What was new in Tablelist 0.9?
------------------------------

1. The documentation now includes the tutorial "tablelist.html" (part
   of which is still work in progress), as well as reference pages for
   the two exported commands "tablelist::tablelist" and
   "tablelist::sortByColumn".

2. The "-listvariable" configuration option is now fully implemented.

3. A column of a tablelist widget can now be made invisible by using
   the new "-hide" option of the "columnconfigure" subcommand.

4. The contents of a row can now be updated with the new "-text" option
   of the "rowconfigure" subcommand.

5. For Tk versions 8.3 or higher the "tablelist::tablelist" command now
   supports the "-disabledforeground", "-labeldisabledforeground", and
   "-state" configuration options.

6. Replaced "[focus]" with "[focus -displayof $win]", so that the code
   will work properly in applications using multiple displays.
   Similarly, the "font measure" command is now invoked with the
   "-displayof $win" option.  This also works around a peculiarity of
   the "font measure" command.

7. Renamed "tablelistBindingTag" to "Tablelist".

8. Fixed a bug in the private procedure "colIndex", for arguments of
   the form "@x,y".  This procedure is invoked (directly or indirectly)
   in the implementation of all commands that take a column or cell
   index or an x coordinate as argument.

9. Numerous further improvements and minor bug fixes.
