6.0		(07/07/2025)
     * Adapting to TclTk9.0 release where tilde is no longer an AUTOMATIC logdir reference
       -    Manifested as a rework to command argument handling to RETAIN tilde-syntax
       -    prompted ADDing GLOB-syntax (primarily for dialog) as SHELL already handles
       -    STILL maintains TclTk8.5 as minimum required
       Additionally, Tk9.0 package rejection had halted ANY/ALL prior TkDiff (Tkt#99)
       PLUS significant enhancements to newDiff Dialog w/MAJOR added Help descriptions
     * Dropped specialized visual configuration SPECIFICALLY concerning a CDE environment
     * Bug fix to inline highlighting logic to avoid occasional missing instances. 
     * Minor enhancement to 'Find' text-search tool to report 'failure to find'
     * Very minor (internal) bug fixes, Help and comment spelling + wording
       
5.7		(05/11/2024)
     * Allows implied "null content" files (eg. UNIX /dev/null) as valid Filespecs
     * Inline hilites now respond immediately after a OFF to ON request
     * Bookmark annotation prompt now relates CURRENT hunk ID on 2nd and more usage
     * Inline hilites no longer randomly ignores the last possible line of hunk

5.6		(11/08/2022)
     * Added recursion ability into directory searching for the 1-FSpec case:
       allows file trees as input. Recommended primarily for the VPATH Scm.
     * Recursion (both single and dual FSpec forms) supports patterned-fname exclusions
     * Repaired merge-preview window jump-scroll action when current hunk is changed.

5.5.3		(10/11/2022)
     * Crash elimination AND better Help info regarding the OPTIONAL "-P file" option.
     * Revised a prior (V5.5.2) fix that mishandled simplifying VPATH revision assignment,
       accidentally deactivating most revision-to-revision command formats for all SCMs.

5.5.2		(08/31/2022)
     * Yet MORE spurious CRASH conditions avoided (primarily in SCM Search startup situations).

5.5.1		(08/19/2022)
     * Minor repair of preference evolution logic to encompass stray begin/end version situations
       responsible for inadvertent CRASH conditions at startup when converting a PRIOR Pref File.

5.5		(07/21/2022)
     * CRITICAL logic repair to 'blanks' suppression support during INLINE hilite!
     * Alternate coding fix to vague (Mac observed) race-condition bug w/combobox mis-creation.
     * Added status display of merge choice counts presently targetted as pure Left or Right
     * Popup menu disables "Edit" (file) when POP occurs over DiffMap (not a L/R window).
       -    BUT is now active over most window elements having a Left/Right connotation.
       -    'Find Nearest' selected above DiffMap evaluates choice at SCALED chosen position.
     * Codified preference 'upgrade' detection, yeilding safer 'new version' transitions.
     * Internal: Preference evolution of older settings now tied to explicit versioning data 
     * Created "Engine config" Prefs tab:
       - permits access to other Diff engines having alternate algorithms.
       - Codifies what is needed/expected FROM the underlying engine and HOW it is accessed.
       - Still permits ad-hoc flag specs AND cmdline pass-thru.
       -    former 'diffcmd' Pref now DERIVED from engine settings (for reference purposes)
       -    former 'ignoreblanks' Pref (on/off) generalized to refer to ALL engine suppressions
       -    primary engine options (suppressions) now specifically delineated AND configurable
       -    shares options among Diff and DiffSrch when same command (1st word), else distinct
     * Added warning HILITE to Preference actions that result in FORCING a new Diff invocation.
     * Internal: general support for "Unified" Diff outputs, facilitating wider Engine acceptance
     * Internal: Dbg messaging permits suspended arg-EVAL until KNOWN they are used (less overhead).
     * Handful of spelling typos, internal naming and code consolidations, as always: updated Help.

5.4		(04/01/2022):
     * Visual Inline-diff SUPPRESSION categories (correlatable to those of Diff) supported
       yet specific choices are INDEPENDANT of said same Diff MATCH suppressions
     * Optional support for MULTIPLE Preference files w/command-line specification added
       permits user configuration for disjoint projects w/alternate SCM requirements
     * Reengineered optional SyncScroll to no longer permit fractured alignment - FOREVER
       only specific features may TEMPORARILY override the Preference when set.
     * New preference allows specifying filename patterns to EXCLUDE from searches among
       directories when forming candidate pairings for examination.
     * Text searching now (optionally) scrolls EITHER/BOTH windows independent of the current
       overall synchronized window preference setting. Allows visual alignment between the
       displayed file content based on individual text searches per each window.
     * Within Vpath SCM context, CWD location now effectively TOP-prunes stated VPATH 
       nodes allowing access to yet older V-nodes w/o editting VPATH 
     * Subdirs WITHIN given Vpath nodes now recognized as legitimate CWD-scoped locations
       permitting operations on directory-based subdivisions while STILL Vpath'd
     * Repaired how Vpath searches for Topmost and/or Prior version for consistent results
     * MouseWheel now scrolls properly when above checkbuttons WITHIN the filelist Dialog

5.3		(12/24/2021):
     * Added VPATH handling, integrated to appear as yet another SCM system.
     * Tkt#83 - repaired a (V5.2) syntax fault of Directory-based filename generation
     * Silenced new recurrence of "TCL-sensitive" characters faulting within input filenames
     * Filelist dialog now immediately responds fully to a threshold change
     * Added missing Wheel scrolling to filelist dialog
     * Ensure "Class" of secondary window(s) REMAIN designated as "Tkdiff"; not "Toplevel"
     * Tkt#82 - usage of the Perforce SCM was crashing (wrong var reference)

5.2.1		(03/27/2021):
     * New user preference affects how multiple-files are presented to the user.
       Choice of menu display has been capped at a variable maximum of 1-25. Now
       uses a separate dialog window when file count exceeds current max setting.
     * Sidestepped Tcl bug affecting "recursive diff" results when default user
       pref "-q" option is removed. Will now correctly suppress "binary" files.
     * Repaired toolbar confusion at startup about using Icon or Text buttons

5.2		(03/04/2021):
     * Permits entire directory TREEs to be scanned for candidate files recursively
     * Now stipples the BOUNDARY LINE during "Split"-push manipulations: clearer feedback
     * Reduce 'interactive startup' reliance on a message console and promote a "retry" paradigm
     * Fixed broken "Find Nearest Diff" (via the popup menu) to use initial popup LOCATION
     * Repaired Windows derivation of the INITIAL temp-dir path preference for NEW users.
     * Resolved minor clipping issue in toolbar combobox (re: proportional fonts)
     * Avoid Diff crash caused by specifying MULTIPLE "ignore blanks" preference options
     * Avoid crash from malformed filename using tilde-expansion to a non-existant user
     * Repaired missing accelerator+Tip for File->Recompute menu item
     * Toolbar buttons now reset fully when a valid Diff execution yeilds ZERO results
     * Visible Focus-tabbing restored to dir/file browser buttons in NewDiff dialog

5.1             (11/11/2020):
     * Now supports user customization of keyboard function bindings
     - new 4th preferences Tab allows review, editting and saving of such bindings
     * Failure-modes for user involved input is now more forgiving (w/feedback)
     - applies to preference modifications and/or inconsistent run-modes.
     * Scrollable bookmarks: allows access when more exist than can fit on screen.
     - bookmark menu w/report 'participation' checkbutton (and annotation access item)
     - bookmark annotation: user specified identities - beyond the default hunk index
     * New report fmt - based on individualized bookmark establishment for content
     * Increased report STATISTICS info, plus a means to view it without needing a report
     * More robust (internal) 'Read-Only' text display re-implementation
     - restores damaged Keyboard scrolling and hotkey usage in addition to GUI traversals
     * Redesigned internal implementation to restore MacOS network-latency reporting support
     * Dropped Monochrome support (revivable, but rather pointless)
     * Incorrect mainwindow MANUAL-resizing logic repaired (improper "gridding")
     * Tkt#73 - repaired typo causing crash of "conflict" file processing
     * Tkt#74 - scrolling w/autoselect ON crashed when scrolled prior to the 1st hunk min-bound
     *        + autoselect now operates passively (autocenter NOT triggered)
     * Tkt#75 - syntactic repair resolves crash of COMBINED merge choice (L+R or R+L) usage
     * Addressed bug displaying a combobox w/multiple monitors, and a NON-virtual window-manager
     * Fixed (yet again) un-raised Tooltip windows on Mac (will NOT happen again)
     * Repaired crash caused by situational ancestral-data corner condition in 3-way Diff
     * Relaxed popup-position management on 2nd+ usage - now re-appears at most recent location
     * Minor fix prevents wrong subwins from squeezing shut during a manual resizing to smaller
     * Repair unintended session-long ASYNc behavior due to incomplete removal of the trigger
     * Ensure Text window focus-highlighting remains visible when Text FG/BG is altered
     * Removal of several (5+) internal excess-work situations improving responsiveness
     * Online help updated to cover aspects of ALL changes (incl. removed restrictions)


5.0             (06/08/2020):
     * NewDiff Dialog can now request a Conflict file comparison
     - It also permits adjustment of SCM choice or search-mode
     - and is now ALWAYS defaulted when no args are given, except
     - in one specific preference-controlled situation (autoSrch).
     * Merging when using an Ancestor file now identifies inconsistent
     - "deletions" similar to additions, among the two versions merging
     - and factors into the automatic merge choice determinations
     * CVS is now able to produce a list of candidate comparisons
     * ALL SCMs doing candidate detection now handle CONFLICTed files
     * URLs (Svn style) accepted as FileSpec by Dialog and Cmdline
     - including usage with/without @Rev suffix and for Ancestor
     * Multiple SCMs and/or cross-branch comparison is now possible
     * Repaired 'conflict' parsing to accept diff3-style files
     * Eliminated a TK-updating race condition involving the DiffMap
     * Interactive diff-region suppression is now possible
     * Setting a line-comparison Font preference now affects entire Window
     * Small features: window manager graphic for TkDiff now provided
     -    displayed filenames are relativized when possible (shorter)
     -    failed Diffs no longer considered Fatal
     -    inappropriate (identical) Ancestor cancels 3way w/notification
     * Minor repairs to: Split/Combine scrolling and single line "push"
     -    line numbering past final hunk corrected
     -    tooltip rendering on a Mac
     -    dblClick "find Nearest hunk" binding when within meta-info window
     -    scrollwheel now works when within Merge meta-info window
     -    Lnum/CBar highlighting no longer fails during hunk-suppresssion
     -    Diffmap draws properly when Diffed text lacked newlines
     -    setting an -I "regex" on the cmdline also activates them,
     -    filenames with "sensitive" characters ($ []) wont crash
     -    Missing/wrong text highlighting on random count of last hunk(s)
     -    Default Filebrowser preferred-view-content filters mis-specified
     - Online help updated/expanded to cover aspects of ALL changes


4.3.5           (08/08/2018):
     * NewDiff Dialog now allows browsing for files OR directories
     - with the Ancestor file also permitted to extract from an SCM
     - additionally it and browsers now stack above each other properly
     * Tool arguments now permit cross-branch SCM comparison specification
     * Ability to view Ancestorfile also denotes 3way mode is active
     * 3way collisions now findable via toolbar dropdown list highlights
     * Textwin labels now tooltip the name+modtime of any NON-temp file
     * Builtin editor now provides Line numbers
     * Fixed recent new color preference settings to "apply" correctly
     * Crash fixed when 3way diff was active and Lnum+Chgbars are OFF
     * Pre-startup latency msg feature now OFF (MacOS X only) fixes Crash
     * Repaired Lnums,etc. to use CDR preference settings when appropriate
    
4.3.4           (07/21/2018):
     * Emergency Re-repair of the (V4.3.3) Merge content corruption issue
     - previous fix targeted a phantom cause (only fixed SOME cases)

4.3.3           (07/19/2018):
     * Critical bug that MIGHT corrupt Merge content via Split use fixed
     * Re-implementation of 3way Diff support now functions properly
     - merge choices are preset via 3way analysis AHEAD of user preference
     - resolved collisions (when possible) also removes its display markup
     * Added status msgs (to a popup), in lieu of a busy cursor, at pgm
       startup w/SCM use to account for potential network latency delay
     - new help info for 3way support/strategy plus latency effects
     * Small bugs/inconsistencies repaired
     - Collision color in the DiffMap now honors its preference value
     - DiffMap is redrawn as needed for Split/Combine and/or collisions
     - Misleading (inactive) filelist per-file 'menu accelerators' removed
     - Avoids crash (chooses line 1) when no CDR exists and invoking Editor
     - Report Save-as filename browser lacked the filetypes option setting

4.3.2           (06/28/2018):
     * Fixed obtuse data-dependant fatal crash caused by inline-diff
       of IDENTICAL lines (induced by Diff itself).
     * minor fixes to newDiff dialog (absent V4.3.1 param), resizing
     * random typos in help info

4.3.1           (06/26/2018):
     * Repaired crash(v4.3) when using the "-conflict file" option
     * Supports Diff 'suppresion' options (Empty or RE-matched lines)
       with ability to enter/manage/save rules, activate from cmdline,
       and interoperate with any supportable 'diff' engine
     * Enhanced and expanded preferences coverage
     - previously hidden settings exposed (map and collision colors)
     - color used during Split/Combine for boundary movement feedback
     - provided interactive color chooser for above
     - added new 'suppression' settings
     - added new 'default side' choice for merge initialization
     - redesigned layout of checkboxes for better readability
     - enhanced feedback for inter-related settings, and or editting
     * builtin file editor now opens at the current diff region
     * avoid unneeded display updates when nothing applicable changed
     * Editorial revisions of online help info (new and old content)
     - better explanations of 'quoting', interfacing to 'diff', and
       more uniform typography
     * minor internal consolidations- dead code removal, upgrade to
       later version of embedded software, contrib patches, etc.


4.3             (06/06/2018):
     * Add ability to create a file-pairs list from a Git diff (by Kevin X),
       then extended (by vampm) facilitating other sources of multi-pairs,
       including local directory-to-directory comparisons and Subversion.
     * Rework the main text windows as a text + canvas hybrid so everything
       stays visually aligned while scrolling with multiple fonts (by vampm)
     * Add a facility to slice individual Diff records into logical pieces
       providing more exacting mergefile generation capabilities (by vampm)
     * Report generation can now suppress NON changed Text lines (by vampm)
     * Merge Preview now indicates diff line contributors and line numbers
     * Repaired handling of data files having random <CR> bytes embedded
     * Numerous small enhancements (wheel scrolling, more GUI feedback, ...)
     * Extensive audit and content update of the online help text (by vampm)

4.2             (2011):
     * Works with Subversion 1.7
     * Make opening file dialog know where it started from, and start in the
       same directory as the first file when looking for the second one.
     * You can now specify a preference for filetypes for the file open/save
       dialogs.
     * Detect PVCS by environment variable (patch 1839361 by nafmo)
     * Update BitKeeper support (patch 3053551 by wscott)
     * Mercurial support (patch 1867700 by damonmc)
     * Rudimentary Git support (patch 1836293 by cecilh3)
     * add help menu items to report versions of wish and diff
     * Fix location of temp files on MacOS X
     * Gave it a debug (-d) option

4.1.4           (11/15/2007):
     * Ignore -u option from svn for usage "svn diff --diff-cmd=tkdiff"
     * Perforce support for P4CONFIG environment variable
     * Remove an old font work-around for Mac, but add a new one for tk8.5
        on Windows
     * Fix duplicate keyboard accelerator for Preferences

4.1.3		(2/20/2006):
     * Fixed incompatibility with older versions of Tcl/Tk
       ("-state disabled").
     * Applied Warren Jones' subversion patch, which prevents the
       svn error that occurs when you omit a revision number.

4.1.2           (2/1/2006):
     * Can now do "tkdiff OLD-URL[@OLDREV] NEW-URL[@NEWREV]" in Subversion

4.1.1           (12/20/2005):
     * Security patch for temp files (CVE-2005-4434)

4.1             (7/4/2005):

     * Clearcase support
     * Better Subversion support
     * -L command line option allows you to control the labels above the
       diff file panes.
     * tkdiff --help or -h print a usage message for command line without
       invoking the GUI.
     * The New Diff Dialog is expanded so you can specify all the options.
     * The two panes can be resized relative to each other using a sash
       widget.  Tk8.4 is recommended, since the implemetation is much better.

4.0.2 changes (11/08/2004):
     * Made sure all the prefs are saved (Bug# 878340)
     * Put all the Aqua stuff in one place

4.0.1 changes (4/27/2004):
     * Fix detection of a ,v file in the current directory for RCS

4.0 changes (3/10/2004):

     * Inline diff highlighting
     * Current line comparison window
     * Support for Subversion
     * better tolerance of Windows filenames
     * CDE, Windows, and MacOSX aware

3.09 changes (5/24/2001):

    * Removed use of the user name in temp file path. This removed a problem
      on Windows when the user name had a space in it.
    * Made diff "edge detection" smarter by using the new smarter overlap code
      for cases where diff decided to treat whitespace slightly different
      on missing-EOL files when doing 3-way diffs.
    * Added the "..." back to the Save options in the merge result window
      when appropriate.

3.08 changes (1/15/2001):

    * Made overlap detection smarter

3.07 changes (12/17/2000):

    * Highlight overlaps in bright yellow during 3-way merge
    * Added "Exit" and "Save & Exit" buttons to merge preview window
    * Removed error that popped up when doing a merge that was
      not necessary.

3.06 changes (unreleased):

    * Minor changes for AccuRev integration

3.05 changes (11/30/1999):

    * Added Jean-Francois' 3-way diff/merge feature
    * Added Bryan Oakley's tabstop feature
    * Added full support for Accurev

3.04 changes (8/5/1999):

    * Basic support for AccuRev. Graphical equivalent of
      'accurev diff foo.c'
    * Fixes as a result of running Scriptics' error
      checker (see archives for details)
    * 'q' is quit

3.03m changes:

    * Added -o <output file> to set the name of the merge
      output file
 
3.03 changes:

    * includes the new line-by-line comparison window
    * bug fix for line numbers not being sync'd initially
    * slight modification for how change bars are colored
    * bug fix for up/down arrow keys (they were moving by
      two lines instead of one)
    * bug fix for Alt-V not opening the View menu (ditto
      for a few other alt- combinations)
    * fixed a couple of -underline options for menus
    * new preferences for enabling the display of the 
      line comparison window, and for configuring how 
      individual characters are highlighted in that window
    * added "<file> vs. <file>" to the window title 
      (eg: foo-old.txt vs. foo.txt - TkDiff 3.03) -- this 
      more closely aligns with Windows standards, and is
      equally useful on other platforms, I suppose
    * online help has been updated to reflect these changes

        + As of 3.00: (11/06/1998)
                A new GUI.
                No more reliance on perl...  It's 100% Tcl/Tk now.
                Built-in editor.
                A "find" facility.
                Lots more...  And all of this thanks to Bryan Oakley!

        + GPL'ed (as of 2.03).

        + RCS, CVS and SCCS support (auto-detected)...  Even more SCM
          systems are supported in 3.00.

        + Highlighted difference regions, randomly accessible, with a
          quick overview/navigation bar.

        + Side-by-side viewing and linked (synchronized) scrolling of files.

        + On-line help and extensive customization (also much-improved in
          3.00).

        + File-merge and change-summary facilities.

        + Line-number toggling (for easier cut & paste), with extra goodies
          as of 3.00.

        + Windows NT support.

...and more stuff I can't even remember, probably.

Much work has been done by Bryan Oakley for this release (in fact, 99%
of it). :-)  Thanks, Bryan!  Keep an eye on the tkdiff home page at
http://www.ipass.net/~klassa/tkdiff for developments...  I don't think
there'll be many, at this point -- Bryan has turned this thing into just
about all you could ask for!  If you have problems, though, please send
bug reports (better yet, patches :-)) against 3.00 to klassa@ipass.net.
