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- This file summarizes all changes made to Tk since version 1.0 was
- released on March 13, 1991. Changes that aren't backward compatible
- are marked specially.
-
- 3/16/91 (bug fix) Modified tkWindow.c to remove Tk's Tcl commands from
- the interpreter when the main window is deleted (otherwise there will
- be dangling pointers to the non-existent window).
-
- 3/16/91 (bug fix) Modified tkColor.c not to free black or white colors:
- some X servers get upset at this.
-
- 3/18/91 (bug fix) Modified tkShare.c to fix bug causing "DeleteGroup
- couldn't find group on shareList" panic.
-
- 3/18/91 (bug fix) Several changes to tkListbox.c and tkScrollbar.c to
- handle listboxes (and scrollbars) with zero total entries in them.
-
- 3/22/91 (bug fix) Fixed a few ='s in tkListbox.c that should be ==.
-
- 3/22/91 (bug fix) Fixed error in main.c that caused BadWindow errors
- in some cases where wish scripts invoke "destroy ."
-
- 3/23/91 (new feature) Added Tk_CancelIdleCall to remove Tk_DoWhenIdle
- handler.
-
- 3/23/91 (bug fix and new feature) Added -name option to main.c, made
- it more clever about choosing name (was always using the name "wish"
- on most Unix systems).
-
- 3/23/91 (new feature) Added TK_CONFIG_STRING option to Tk_ConfigureWidget,
- used it to malloc strings for various widget options that used to be
- Tk_Uid's (e.g. button text, message strings, etc.). Eliminates core
- leaks when values change in continuous non-repeating fashion.
-
- 3/29/91 (new feature) Added Tk_Preserve, Tk_Release, and
- Tk_EventuallyFree procedures to help manage widget records and avoid
- premature memory free-ing.
-
- 4/4/91 (bug fix) Fixed problem in tkWm.c where top-level window geometry
- wasn't tracking correctly when wm-induced size change also changed window
- position (e.g. menus wouldn't be displayed at the right places).
-
- 4/5/91 (new feature) Added "invoke" option to widget command for buttons,
- check buttons, and radio buttons.
-
- 4/5/91 (new feature) Added "unpack" option to "pack" command.
-
- 4/5/91 (bug fix) Changed tkPack.c to use new Tk_Preserve code and be
- more careful about window deletions that occur while repacking is in
- progress.
-
- 4/6/91 (bug fix) Major overhaul of deletion code in all widgets to use
- Tk_Preserve and Tk_Release. Should fix many problems.
-
- 4/6/91 (bug fix) Changed "winfo children" to generate correct lists
- when child names have embedded spaces.
-
- 4/6/91 (new feature) Added "screenheight" and "screenwidth" options to
- "winfo".
-
- 4/18/91 (bug fix) Binding mechanism didn't correctly handle very long
- %-substitutions in commands (e.g. long path names) and caused memory
- to be overwritten. Modified tkBind.c to fix.
-
- ---------------------- Release 1.1, 4/18/91 -------------------------
-
- 4/19/91 (bug fix) Inconsistent ICCCM handling of coordinates of reparented
- windows causes windows to gradually walk south when moved or resized.
- Fixed tkWm.c to patch around the problem.
-
- ---------------------- Release 1.2, 4/24/91 -------------------------
-
- 4/26/91 (new feature) Added -geometry and -display switches to wish.
- Also wrote wish manual entry.
-
- 5/3/91 (bug fix) Fixed bug in tkListbox.c that caused garbage to appear
- at right edge of window when strings were to large to fit in window.
-
- 5/3/91 (bug fix) Fixed bug in tkListbox.c where topIndex wasn't getting
- updated when elements were deleted: tended to cause errors in
- communication with scrollbars.
-
- 5/16/91 (bug fix) Fixed bug in tk3d.c, which caused core dumps when
- consecutive points in a polygon were the same (happened with some
- configurations of radio buttons, for example).
-
- 5/16/91 (bug fix) Fixed main.c to allow stdin to be redirected.
-
- 6/1/91 (bug fix) Make sure that pointers are never used after being
- freed.
-
- 6/15/91 (bug fix) Fixed bug in tkBind.c that caused current binding
- values to not always be printed correctly.
-
- 6/15/91 (bug fix) Make sure that interpreters are always unregistered
- when their main windows are deleted, and make wish delete the main
- window before exiting.
-
- 8/21/91 (misfeature correction) Automatically set source of window
- position to "user" in "wm geometry" command, unless it has been
- explicitly set to "program".
-
- 9/5/91 (bug fix) Modified option code to accept '#' as a comment
- character in .Xdefaults files, in addition to '!'.
-
- 9/10/91 (misfeature correction) Changed binding mechanism so that
- numeric %-sequences are output in decimal instead of hex.
-
- 9/19/91 (bug fix) Fixed bug in Tk_DoOneEvent(1) where it wasn't
- checking files and X connections properly so it missed events.
-
- 10/6/91 (new feature) Reorganized tkBind.c to provide generic "binding
- table" structure, which can be used to create bindings on items in
- canvases as well as windows.
-
- 10/6/91 (new feature) Upgraded buttons and menus to use new tracing
- code in Tcl 6.0. Allows radio buttons and check buttons to both set
- and clear themselves when associated variable changes.
-
- 10/17/91 (bug fix) Fixed 2 bugs in listboxes: accidentally advanced the
- selection when new entries were inserted in the listbox after the location
- of the selected item(s), and goofed up on redisplay if selected item
- was deleted and then selection was immediately lost.
-
- 10/27/91 (bug fix) "pack unpack" wasn't telling Tk that it no longer
- manages window; this led to core dumps in some situations.
-
- 10/31/91 (reorganization) Renamed manual entries so that they are no
- more than 14 characters in length.
-
- 10/31/91 (reorganization) Changed tk.h and tkInt.h so that tkInt.h
- doesn't needed to be included by tk.h.
-
- 11/3/91 (portability improvement) Eliminated use of "class" as a variable
- name, since it's a reserved word in C++.
-
- 11/7/91 (reorganization) Many changes to upgrade for Tcl 6.1 including
- use of Tcl hash tables instead of separate "Hash_" module. The "lib"
- subdirectory is no longer needed in Tk.
-
- ---------------------- Release 1.3, 11/7/91 -------------------------
-
- 11/24/91 (bug fix) Fixed bug causing occasional errors if existing bindings
- are modified (FindSequence in tkBind.c forget to set *maskPtr).
-
- 11/24/91 (bug fix) Used wrong hash table in Tk_GetColorByValue. Could
- cause new entries to get created unnecessarily.
-
- 12/2/91 (bug fix) Changed "bind" code to put backslashes in front of
- special characters (e.g. [ or \) that appear in %-replacements, so that
- they can be parsed cleanly.
-
- 12/10/91 (bug fix) Manual entries had first lines that caused "man" program
- to try weird preprocessor. Added blank comment lines to fix problem.
-
- 1/2/92 (documentation cleanup) Changed manual entries for Tk_GetBitmap
- and the like to make it more clear that the argument must be a Tk_Uid
- and not a string.
-
- 1/2/92 (bug fix) Fixed problem where scrollbars that were very short or
- very narrow (too small to hold both arrows) could cause negative values
- in calls to XClearArea, which crashed some servers.
-
- 1/2/92 (bug fix) Fixed bug in TkMeasureChars occurring when maxChars
- is 0. Occasionally affected things like message window geometry.
-
- 1/3/92 (new feature) Added procedures Tk_GetJustify, Tk_GetAnchor,
- Tk_GetCapStyle, and Tk_GetJoinStyle, plus support for these things
- in Tk_ConfigureWidget.
-
- ---------------------- Release 1.4, 1/10/92 -------------------------
-
- 1/12/92 (bug fix) TkMenubutton.c wasn't cleaning up mbPtr->varName
- properly during menubutton cleanup if an error occurred during
- menubutton creation.
-
- 1/19/92 (bug fix) Fixed off-by-one bug in tkListbox.c that caused
- scrollbars to display a slider that was too large.
-
- 2/10/92 (bug fix) Tk_CreateFileHandler didn't correctly handle case
- where new mask was specified for existing handler.
-
- 2/13/92 (bug fix) Tk_DeleteAllBindings wasn't correctly removing
- bindings from the pattern table: only did the removal for the
- first pattern in a pattern list.
-
- 2/15/92 (new feature) Added procedures Tk_DefineBitmap and
- Tk_SizeOfBitmap. Tk_GetBitmapFromData is now considered obsolete
- and probably shouldn't be used anymore. Tk_GetBitmapFromData
- is now implemented by calling Tk_DefineBitmap and Tk_GetBitmap.
-
- 2/15/92 (new feature) Added "curselection" and "select clear" options
- to widget command for listboxes.
-
- 2/15/92 (new feature) Added Tk_3DBorderColor procedure.
-
- 2/17/92 (relaxed limitations) Changed scrollbars so they no longer limit
- the slider position to lie within the object's range: can scroll off the
- end of an object, if the object permits it. Changed listboxes and
- entries to explicitly prevent viewing off the ends. Also relaxed
- listbox index checks so that out-of-range indices are automatically
- adjust to fit within the listbox range.
-
- 2/19/92 (bug fix) tkWindow.c tended to leave half-created windows around
- if a new window's name was found to be in use already. Fixed to clean
- them up.
-
- 2/22/92 (new feature) Added -anchor, -bitmap, -height, -textvariable,
- -width options to labels, buttons, check buttons, menu buttons, and radio
- buttons. This means that (a) size can be controlled better, (b) bitmaps
- can be displayed in any buttons, (c) the position of the text within the
- button can be controlled, and (d) a button can be made to display the value
- of a variable, continuously updating itself. Also changed -selector option
- so that if it's specified as an empty string then no selector is drawn
- for the button.
-
- 2/22/92 (new feature) Changed menus to support bitmaps in menu entries:
- added new -bitmap option for entries.
-
- 2/26/92 (bug fix) "after" command, when invoked with just one argument,
- called Tk_Sleep rather than registering a timer handler and looping on
- Tk_DoOneEvent. As a result, it caused the application to become non-
- responsive to X events during the sleep. Changed to use a Tk_DoOneEvent
- loop so that it is responsive.
-
- 2/26/92 (bug fix) Tk's main program didn't map the main window until
- after the startup script returned. Changed to map the window as a
- do-when-idle handler, so that scripts can cause the window to be
- mapped immediately with a call to "update" or "after".
-
- 2/28/92 (bug fix) "wm withdraw" wasn't working if invoked before window
- was originally mapped: window got mapped anyway. Fixed so that the
- window doesn't get mapped as long as it's withdrawn.
-
- 2/29/92 (new feature) Can use "focus none" to clear input focus.
-
- 2/29/92 (bug fix) Fixed tkEvent.c to generate SubstructureNotify events
- properly. These weren't being generated previously.
-
- 2/29/92 (bug fix) Fixed entries so that newline characters can be properly
- displayed (as `\x0a'). Had to change interface to TkDisplayChars in order
- to do this (added flags argument).
-
- 2/29/92 (bug fix) Change Tk not to update size and position of top-level
- windows directly during calls like Tk_ResizeWindow. Instead, wait until
- actual event is received. This makes updates happen at same time as
- callbacks.
-
- 3/6/92 (bug fix) TkMenubutton.c was dumping core when a menubutton was
- pressed at a time when there was no associated menu for the button.
-
- 3/6/92 (new feature) Added Tk script library directory with official
- Tk initialization file "tk.tcl". Other procedures used by Tk are in
- other files. Tk procedures and variables all have names starting
- with "tk_". Also added Wish startup script "wish.tcl", which sources
- both the Tk and Tcl startup scripts. This means that things like
- auto-loading and abbreviation expansion are now available in wish.
- Added new variables tk_library, tk_priv, and tk_version.
-
- 3/6/92 (new feature) It's now possible to set bindings for whole
- classes by using the class name in the bind command. For example,
- "bind Button <Enter> {puts stdout Hi!}" will cause a mesage to be
- printed whenever any mouse button is entered. Can also use "all"
- to set bindings for all widgets. Widget-specific bindings override
- class bindings which override "all" bindings.
-
- 3/6/92 (reorganization) Changed buttons (all flavors) and listboxes to
- eliminate all hard-wired behavior. Instead, default behavior is set
- by class bindings in tk.tcl. Also set up class bindings for menus,
- menubuttons, and entries, which previously had no default behavior at
- all. Scrollbars and scales still have hard-wired behavior that can't
- be overridden.
-
- 3/7/92 (look-and-feel change) Changed listboxes and entries and menus
- to use button 2 for scanning instead of button 3. This is more consistent
- with the official Motif use of button 2 for dragging.
-
- 3/10/92 (new features) Added more options to "winfo" command: screencells,
- screendepth, screenmmheight, screenmmwidth, and screenvisual.
-
- 3/13/92 (bug fix) Event sharing mechanism (tkShare.c) wasn't checking
- to see whether window was mapped before sharing events with it.
-
- 3/16/92 (bug fix) Tk_SetInternalBorderWidth was passing wrong window to
- geometry-management procedures, causing core-dumps when menu buttons
- had their border widths changed.
-
- 3/16/92 (bug fix) Menus were setting their geometry directory rather
- than using Tk_GeometryRequest mechanism.
-
- 3/17/92 (new feature) Added -cursor option to all widgets to set the
- active cursor for the widget. Also added TK_CONFIG_ACTIVE_CURSOR
- configure type.
-
- 3/18/92 (new feature) Implemented generalized screen coordinates to
- allow resolution-independent specification in many cases (but pixel-
- based coordinates are still OK). Added Tk_GetScreenMM(),
- Tk_GetPixels(), new configure types TK_CONFIG_SCREEN_MM and
- TK_CONFIG_PIXELS. Changed widgets to use this new configure types
- wherever possible (a few of the more complex cases still haven't
- been taken care of yet). Added "pixels" and "fpixels" options to
- "winfo" command.
-
- 3/18/92 (new feature) First cut at canvas widgets is done and part of
- the official Tk now. Canvases display text and structured graphics,
- and allow you to bind commands to events related to the text and
- graphics.
-
- 3/21/92 (new feature) Added new "place" command. It implements a
- new geometry manager that provides fixed placement, rubber-sheet
- placement, and combinations of the two. Eliminated the commands
- "move", "resize", and "map" that were provided by main.c but never
- officially supported; the placer provides all of this functionality.
-
- 3/23/92 (bug fix) Fixed bug in tkWm.c where top-level windows were
- occasionally not being given the right size. The problem occurred
- when a string of resizes happened all in a row (such as deleting all
- the windows in an application and then recreating them).
-
- 3/23/92 (new feature) Added Tk_CoordsToWindow procedure and
- "winfo containing" command. These may be used to locate the window
- containing a given point.
-
- 3/28/92 (new feature) Added "-exportselection" option to listboxes,
- so that listbox selection need not necessarily be the X selection.
-
- 4/12/92 (bug fix) Changed menu buttons to store name of menubutton
- in the associated variable, rather than the name of the menu. This
- is necessary in order to allow several menu buttons to share the
- same menu.
- *** POTENTIAL INCOMPATIBILITY ***
-
- 4/12/92 (bug fix) Fixed core dump that occurred in tkError.c when
- removing the first error record from the error list.
-
- 4/15/92 (bug fix) Fixed bug in tkBind.c that prevented <KeyPress-1>
- event specifications from being processed correctly: the "1" was
- treated as a button name rather than a keysym.
-
- 4/18/92 (new feature) Added Tk_DefineCursor and Tk_UndefineCursor
- procedures.
-
- 4/18/92 (new feature) Major revision to listboxes. Can now scroll and
- scan in both x and y, plus -exporselection option allows selection not
- to be exported. The "view" widget command has been replaced by "xview"
- and "yview", and the "scan" widget command has a new syntax.
- *** POTENTIAL INCOMPATIBILITY ***
-
- 4/18/92 (new feature) Added -exportselection option to entries, so you
- can select whether you want the entry selection to be the X selection
- or not.
-
- 4/24/92 (new features) Added TK_CONFIG_CUSTOM type to Tk_ConfigureWidget,
- plus added new flags TK_CONFIG_NULL_OK, TK_CONFIG_DONT_SET_DEFAULT,
- and TK_CONFIG_OPTION_SPECIFIED. Several other new types, such as
- TK_CONFIG_CAP_STYLE, were also added as part of implementing canvases.
-
- 4/29/92 (bug fix) Changed "-selector" default for menus to have separate
- values for mono and color.
-
- 4/30/92 (bug fix) Fixed bug in tkListbox.c where it occasionally generated
- bogus scroll commands (last index less than first).
-
- 4/30/92 (reorganization) Moved demos directory to "library/demos".
-
- ---------------------- Release 2.0, 5/1/92 -------------------------
-
- 5/2/92 (bug fix) Fixed problem in tkListbox.c where it was doing too many
- redisplays after repeated insertions. Also reduced number of invocations
- of scrollbar commands.
-
- 5/7/92 (portability improvement) Changed main.c not to use TK_EXCEPTION
- flag; it isn't needed and it causes problems on some systems.
-
- 5/9/92 (bug fix) Plugged core leaks in tkListbox.c and tkBind.c
-
- 5/9/92 (bug fix) TkBind.c was accidentally deleting bindings during
- attempts to print non-existent bindings.
-
- 5/11/92 (bug fix) Maximum name length for applications (name used in
- "send" commands) was too short (only 20); increased to 1000. Also
- fixed bug related to over-long names that caused core dumps.
-
- 5/13/92 (bug fix) tkShare.c was using a dangling pointer if a share
- group was deleted as a side-effect of a shared event.
-
- 5/13/92 (bug fix) Various initialization and core leak problems in
- tkGC.c, tkSend.c, tkMenu.c, tkEvent.c, tkCanvas.c, tkCanvPoly.c,
- tkCanvLine.c, tkListbox.c, tkEntry.c.
-
- 5/13/92 (bug fix) Empty entries could be scanned off the left edge,
- displaying a garbage character.
-
- 5/13/92 (bug fix) Fixed a few problems with window manager interactions,
- such as tendency for windows to spontaneously shrink in size. By no
- means are all of the problems fixed, though.
-
- 5/13/92 (performance optimization) Changed Tk_GeometryRequest not to
- invoke geometry manager unless requested size has changed.
-
- ---------------------- Release 2.1, 5/14/92 -------------------------
-
- 5/1/92 (new features) Added flags like TK_IDLE_EVENTS to Tk_DoWhenIdle,
- plus added "idletasks" option to "update" command. Tk_DoWhenIdle arguments
- look different now, but the change should be upward-compatible.
-
- 5/17/92 (new feature/bug fix) Added support for VisibilityNotify events
- to the "bind" command. For some reason they weren't supported previuosly.
-
- 5/17/92 (new feature) Added "tkwait" command.
-
- 5/17/92 (new feature) Added "grab" command.
-
- 5/17/92 (new feature) Added "-width" option to messages. Also changed
- messages to use the computed (i.e. desired) line length when displaying,
- not the actual width of the window.
-
- 5/17/92 (bug fixes) Did some more fiddling with tkWm.c in the hopes
- of improving window manager interactions. Now there won't be more than
- one configure request outstanding to the wm at a time.
-
- 5/17/92 (bug fix) Arrowheads on canvas lines weren't being translated
- or scaled correctly.
-
- 5/20/92 (bug fix) Page-mode scrolling didn't work correctly for canvases
- (wrong windowUnits was passed to scrollbars).
-
- 5/20/92 (bug fix) Changed scrollbars not to lose highlight when pointer
- leaves window with button down. Also changed redisplay to double-buffer
- for smoother redraws.
-
- 5/21/92 (new feature) Added "gray50" and "gray25" as predefined bitmaps.
-
- 5/22/92 (new feature) Buttons can now be disabled using the "-state" and
- "-disabledforeground configuration options. The "activate" and "deactivate"
- widget commands for buttons are now obsolete and will go away soon.
- Please change Tcl scripts not to use them.
-
- 5/23/92 (new feature) Entries can now be disabled using the "-state"
- config option. Also improved class bindings for entries to keep the
- cursor visible in the window when operations occur. Also made slight
- improvements in the way redisplay is done.
-
- 5/23/92 (new feature) Added "-textvariable" option to entries so that
- the text in an entry can be tied to the value of a global variable in
- a fashion similar to buttons.
-
- 5/27/92 (new feature) Added "-textvariable" and "-anchor" options to
- messages.
-
- 5/28/92 (new feature) Added "-padx" and "-pady" and "-underline" options
- to menubuttons.
-
- 5/28/92 (feature change) Changed "-width" and "-height" options on
- all flavors of buttons and menubuttons so that they are orthogonal
- to "-padx" and "-pady". It used to be that -width overrode -padx
- (no padding). Now they accumulate.
-
- 5/29/92 (new feature) Added "-disabledforeground" option to menus and
- all flavors of buttons (can specify color for disabled things rather
- than just using stipple to gray out).
-
- 5/29/92 (new features) Added many new options to menu entries:
- -activebackground, -background, -font, -state, -underline. The
- "disable" and "enable" widget commands for menus are now obsolete
- and will go away soon. Please change Tcl scripts not to use them.
-
- 5/29/92 (new features) Added "atom" and "atomname" options to "winfo"
- command.
-
- 5/29/92 (new feature) Wrote tk_listboxSingleSelect procedure, which
- can be used to change listbox behavior so that only a single item is
- selected at once.
-
- 6/1/92 (new feature) Added new modifier names "Meta" and "Alt" for
- "bind" command.
-
- 6/3/92 (new feature) Added "winfo toplevel" command.
-
- 6/3/92 (new feature) Made several changes for greater Motif compliance,
- including:
- - menu retention if you click and release in the menu button,
- - keyboard traversal of menus (see traversal.man)
- - no widget flashing if you set $tk_strictMotif to 1
-
- 6/15/92 (bug fix) Fixed problem in tkBind.c where command string for a
- binding could get reallocated while the command was being executed (e.g.
- bindings that delete or change themselves).
-
- 6/15/92 (bug fix) Don't allow "tabWidth" field to become zero in tkFont.c:
- can cause core dumps for fonts that don't enough information to compute
- tab widths.
-
- 6/19/92 (bug fix) Fixed bug in binding mechanism that caused structure-
- related events to be reported both to the correct window and its parent.
-
- 7/14/92 (bug fix) Changed tkColor.c not to free colors for visual types
- StaticGray or StaticColor.
-
- 7/15/92 (new feature) Text widgets now exist. They display any number of
- lines of text with a variety of display formats, and include hypertext
- facilities. See the manual page for details.
-
- 7/20/92 (bug fix) If a top-level window was put in the iconic state to
- begin with, it could be deiconified with "wm deiconify .foo" until it had
- first been deiconified by hand from the window manager. Tk was getting
- confused and thought the window was mapped when it wasn't.
-
- 7/29/92 (bug fix) Don't permit rectangles or ovals to have zero-sized
- dimensions. Round up to at least one pixel.
-
- 7/29/92 (new features) Major upgrade to canvases:
- - new item types: arc, window, bitmap
- - added Bezier spline support for lines and polygons
- - rectangles and ovals now center their outlines on the shape,
- rather than drawing them entirely inside the shape
- - new "coords" and "bbox" widget commands
- - new "-tags" option for all item types.
- - new "-confine" option to prevent scrolling off edge of canvas.
-
- 8/6/92 (new feature) Added "-width" and "-height" options to frames.
- The "-geometry" option is now obsolete and should be removed from Tcl
- scripts: it may go away in the future.
-
- 8/7/92 (bug fix) Error messages in Tk_ParseArgv were sometimes including
- the option name where they should have included its value.
-
- ---------------------- Release 2.2, 8/7/92 -------------------------
-
- 8/7/92 (bug fix) Changed tkCanvas.c to be more conservative in the area
- it passes to XCopyArea.
-
- 8/8/92 (bug fix) Fixed bug in tkTextDisp.c that sometimes caused core
- dumps when text views changed (e.g. typing return on last line of screen).
-
- 8/8/92 (bug fix) Fixed bug in menu.tcl that caused errors when using
- keyboard to traverse over separator menue entries.
-
- 8/10/92 (bug fix) Changed to use OPEN_MAX instead of MAX_FD to compute
- maximum # of open files.
-
- 8/10/92 (bug fix) Canvases weren't updating scrollbars on window size
- changes. They also weren't recentering canvases on window size changes.
-
- 8/10/92 (bug fix) There were still a few places where commands were being
- invoked at local level instead of global level (e.g. commands associated
- with buttons and menu entries).
-
- 8/10/92 (bug fix) TkBind.c used to ignore explicit shift modifiers for
- all keys (i.e. <Shift-Tab> was treated the same as <Tab>). Modified to
- allow explicit request for shift modifier, like <Shift-Tab>.
-
- 8/13/92 (feature change) Changed default fonts to request "Adobe" fonts
- explicitly.
-
- 8/16/92 (bug fixes) Modified tkCanvArc.c and tkTrig.c to increase slightly
- the bounding boxes for arcs, in order to make sure that proper redisplay
- occurs when arcs are moved (little turds were getting left behind).
-
- 8/16/92 (bug fix) Modified tkCanvas.c not to redraw at all if the redisplay
- area is off the screen. Also, only do a background clear for the portion
- of the redraw area that is on-screen. Also, reduced size of off-screen
- pixmaps used for redisplaying, which speeds up redisplay in some cases.
-
- 8/19/92 (bug fix) Canvases that were taller than wide were not being
- redisplayed properly.
-
- 8/20/92 (new feature) Added Tk_CreateGenericHandler procedure for trapping
- all X events (useful for tracing, watching non-Tk windows, etc.).
-
- 8/21/92 (bug fix) Widgets weren't always being notified when they got
- the focus back again (the problem had to do with grabs and menus in
- particular).
-
- 8/21/92 (new feature) Added "-state" option to scale widgets.
-
- 8/22/92 (new feature) Changed tkBitmap.c to allow tilde-substitution
- to occur in bitmap file names.
-