2.01 (2026-11-07):
	The first release of the modernized distribution (the 2.00 entry
	below, the development history of the port, was never released
	under that number).  The release layout: the user documentation
	(README.md, Changes, BUGS, doc/etext.pod) is inside the
	distribution; Makefile.PL declares the prerequisites (Perl 5.10,
	Tk 804.027, Test::More) and the metadata (CPAN META spec 2:
	license, repository, bug tracker; the bundled FreezeThaw and
	Text::TeX under utils/ are not indexed); the Tcl/Tk flavour of the
	sources is not shipped (it stays in the repository).  Since the
	2.00 entry was written: undo re-creates embedded images and
	windows; embedded windows inside blocks can be addressed by name
	and index; "display linestart", "display lineend" and "+N display
	lines", with Home and End on the display line (all described
	under 2.00 below).  The reports for upstream (Perl/Tk, Tcl/Tk) are
	in upstream/reports/ of the repository, one file per report.
2.00 (2026-11, not released):
	The Perl extension (Tk::eText) made to build and work with
	today's Perl (5.38) and Perl/Tk (804.036):
	- standalone ExtUtils::MakeMaker/Tk::MMutil build against the
	  installed Perl/Tk, no Tk build tree needed; loaded with
	  XSLoader; all internal symbols prefixed (eTextSyms.h) so that
	  they cannot clash with Tk's own text widget;
	- Tk-b9 "Lang" layer replaced by the Tk 804 API (Tcl_Obj
	  arguments and results, Tcl_ListObjGetElements, Perl regexps
	  via Tcl_GetRegExpFromObj, Tcl_ObjSetVar2 for -count);
	- XFontStruct/TkMeasureChars/TkDisplayChars replaced by Tk_Font,
	  Tk_MeasureChars, Tk_DrawChars, Tk_UnderlineChars, with tab and
	  newline handling done by the widget, as in Tk 8.4;
	- Tk::eText is a subclass of Tk::Text and gets all its bindings;
	  the demo moved to demo/etext.pl and ported (Tk 804 has no
	  Menubar with a command() method; option names need dashes;
	  ornaments are Unicode characters now);
	- automated tests in t/ (t/basic.t, t/leak.t).
	Memory leaks fixed:
	- each call of the block layout callback leaked a reference to
	  the widget (hence the widget's Perl object could never be
	  freed); the cursor blink re-lays-out the line it is on, so
	  with the cursor in a block this leaked twice a second;
	- TkTextRedrawRegion leaked an X region per call (focus change,
	  expose);
	- "block list" leaked one scalar per call, and every typed
	  element of the result leaked its payload;
	- the embedded-window element of "block list" leaked a widget
	  reference.
	Other fixes:
	- search -nocase works for exact (non-regexp) searches (the
	  lower-casing of the pattern had been disabled);
	- "block configure" default of -layoutdepth is -1, as documented;
	- "block data" is available as a method (blockData);
	- Tcl_IntResults with a single value aborts in Tk 804; replaced.
	Fixes after a review of the port (t/regress.t covers them):
	- "tag prevrange" crashed whenever the last toggle of the tag was
	  not on the first line of its B-tree node (NULL dereference, or an
	  index past the end of the line); the backward search is reworked:
	  only lines of the outermost tree count against its line budget,
	  it leaves a block into the enclosing line, and compares the stop
	  position with external offsets.  Verified against "tag ranges"
	  for every index/stop position in a dozen block layouts.  (Where
	  Tk's own text widget returns a range starting before index2,
	  contrary to its documentation, eText follows the documentation.)
	- "search -nocase": the lower-casing of the extracted line wrote
	  through a pointer taken before the buffer was appended to (which
	  reallocates it under Perl/Tk): heap corruption on any line longer
	  than the initial buffer.
	- A layout callback returning a single row (all an -empty block
	  needs) was rejected ("List of wrong size").
	- "block delete" / widget destruction did not release the block's
	  callbacks and -layoutwidths (a -layoutcmd closure kept the widget
	  alive); tag -data was never released; "dump -command" given twice
	  leaked the first callback; "block list" could leak a pending value
	  before an embedded window, and returned the block instance data
	  by alias (modifying the result modified the block).
	- "window cget -align" died with "Modification of a read-only
	  value" (and printed "centre" for "center"); "tag bind" queried
	  without a binding croaked with an empty message; "dump" read past
	  the argument vector when the last argument began with "-";
	  "search -nocase" leaked the pattern copy on an invalid index.
	- A display line too narrow for one character split a multi-byte
	  character (whole UTF-8 characters are forced now, as in Tk 8.4).
	- Build: MakeMaker ran eTextSyms.PL during every "make" and, on a
	  fresh checkout, replaced the symbol-prefix header by an empty one
	  (so the next build would have clashed with Tk's text widget); the
	  script is no longer run automatically, is idempotent, and refuses
	  to write an empty header.  One uncast allocation that GCC 14
	  rejects.  Dead Tcl-only compatibility macros removed.
	- editXxx/imageXxx methods now reach the explicit "not implemented"
	  message; the demo honours $ENV{kprefix}; POD file references.
	Features of the modern Tk text widget, added later in 2.00 (each
	with a test that compares the behaviour with Tk's own text widget
	on the same text where that is possible):
	- text indices count characters, not bytes (Perl/Tk 804 stores
	  text as UTF-8): the Tk 8.4 design - byte offsets inside, the
	  conversion at the "line.char" boundary - extended to count into
	  blocks (the dummy position at the start of a block is one
	  character); search -count and -nocase, dump, "block of", bbox,
	  wordstart/wordend follow.  A match inside a block was reported
	  one position too far (TkIBTreeTextAppend).  t/utf8.t.
	- the -elide tag option: hidden text takes no room, inside blocks
	  too (a hidden block disappears, hidden text inside a block
	  narrows it).  search does not skip elided text.  t/elide.t.
	- the image subcommand (embedded images, Tk 8.4's tkTextImage.c);
	  images work inside blocks and appear in "block list" as
	  Tk::Text::EmbImage; "dump -image" reports the image's name in
	  the widget, as documented.  t/image.t.
	- the edit subcommand (undo, redo, reset, separator, modified),
	  -undo, -maxundo, -autoseparators, <<Modified>>; the stack
	  (tkTextUndo.c) records the changes themselves and the widget
	  applies them with its own procedures.  The text of a deleted
	  block comes back as text when undone.  <<Undo>> and <<Redo>> are
	  bound.  (Perl/Tk's Tk::Text records nothing: "edit undo" there
	  always says "nothing to undo".)  t/edit.t.
	- the demo's TeX symbol tables (utils/Text/TeX.pm) give Unicode
	  characters instead of codes in 8-bit X11 symbol fonts, with
	  reverse maps (%char2tex, %tex_by_char) for the TeX export; the
	  sample document demo/save.tsf is converted; Save/Load use UTF-8.
	  t/tex.t, t/demo.t (which drives the demo under X).
	Fixes and additions after that:
	- "tag nextrange" missed a range starting at index1 inside a block
	  (it looked for the on-toggle in the outer line); the forward tag
	  search compared a stop position inside a block with internal
	  offsets (TkBTreeNextTag, the "XXXX Wrong" of 1997); TkTextRedrawTag
	  handed internal indices to the display-line search.  t/regress.t
	  sweeps nextrange over the block layouts too (6,456 queries).
	- search leaves elided text out unless -elide is given, and so does
	  the selection, as in Tk 8.4 (the line extraction skips elided
	  segments and blocks under TKT_GET_NOELIDE); search -count counts
	  the characters of the matched text.
	- "+N lines" keeps the character position (Tk keeps the byte offset,
	  TK_BUGS.md A5).
	- dump looks into blocks: the elements inside a block are reported
	  with external indices, between "block" and "blockend" elements
	  (the -block switch, part of -all).  t/dump.t.
	- undo re-creates the blocks (leaves, nesting, instance data), tags
	  and marks of a deleted range that does not cut a block, from what
	  "block list" reports, with the tag toggles where they were; a
	  deletion that cuts a block (which the widget dissolves) comes back
	  as text; windows and images are not re-created.  "block data"
	  accepts the start position of an empty or top-level block.  The
	  demo has -undo on: Control-z undoes, formulas included.
	- TK_BUGS.md: A4 (search -nocase and case-changing lengths), A5,
	  B6 (booleans), C4 (Tk::Text's undo records nothing), C5 (dump
	  -image), D5.
	The next batch:
	- undo of a deletion that cut blocks re-creates them.  Such a
	  deletion is recorded as the "block list" of the smallest range
	  around it that cuts no block, with the size of what the
	  dissolution of the cut blocks leaves behind (TkIBTreeCutRange);
	  the undo takes those remains out and re-inserts the list, redo
	  repeats the original deletion.  Found on the way: a right-gravity
	  mark in a re-created range drifted to the end of the insertion
	  (text inserted at an index goes before the right-gravity marks
	  there; such marks get their gravity back only at the end now);
	  deleting all of a block but its head, or all but its tail (which
	  deletes the block, as documented), crashed: TkBTreeKillBlockProc
	  freed the lone newline of an emptied block while the outer line
	  still linked to it, and TkBTreeDeleteChars rebalanced from a line
	  of the destroyed block.  t/edit.t (a dozen layouts: the text,
	  "dump -all" and the block list before and after), t/regress.t.
	- the "display" and "any" index modifiers of Tk 8.5: "+N display
	  indices" (or chars) steps over elided text, "display wordstart"
	  and "display wordend" see the visible characters only ("any"
	  means the plain modifier; "indices" is accepted as a synonym of
	  "chars").  The widget's cursor keys (Left, Right, Home, End,
	  the word keys, the Emacs ones) use them, so
	  the insertion cursor skips elided text, as in Tk 8.5, where
	  Tk::Text's can sit in it.  Tk 8.6's "display wordend" walks into
	  elided text (TK_BUGS.md A6); etext's does not.  t/elide.t (every
	  position of a text with elided ranges, compared with wish if it
	  is installed; blocks; the keys).
	- undo re-creates embedded images and windows (Tk's text widget
	  restores neither): the Tk::Text::EmbImage and Tk::Text::EmbWin
	  elements of "block list" carry the options as option/value
	  pairs, and the undo creates the segment again through the image
	  or window command.  An image whose Tk image is gone comes back
	  empty; a window given with -window was destroyed with the
	  deletion (as in Tk) and comes back as an empty window segment,
	  one with -create is created again when displayed; either way
	  the segment keeps its unit of index space, so the recorded
	  indices of the other changes stay right.  This covers images
	  and windows among the remains of a cut block.  t/edit.t.
	- an embedded window inside a block can be addressed by name and
	  by index: "index" by the window's name gave the position inside
	  the block, and "window cget"/"window configure" could not find
	  the segment there.  t/regress.t.
	- "display linestart", "display lineend" and "+N display lines"
	  (Tk 8.5): the display line containing an index is found by
	  laying the logical line out from its start; "display lines"
	  keeps the x position, as the Up and Down keys do, passes over
	  entirely elided lines and stops at the last display line of
	  the text (Tk 8.6's answer past the end depends on the x
	  position, TK_BUGS.md A7).  Display lines never span logical
	  lines here: a line whose newline is elided still ends a display
	  line (Tk 8.5 merges it with the next one; the answers differ
	  only around an elided newline), and the widget wraps as Tk 8.4
	  does (a space at the right margin needs a pixel of room, Tk 8.5
	  lets it hang over).  Home and End go to the first and the last
	  visible position of the display line (Tk 8.5).  t/elide.t:
	  every position of a wrapped text with elided ranges compared
	  with wish 8.6.14 for display linestart, lineend and -2..2
	  display lines (1126 queries), after checking that the two wrap
	  alike.

Alpha3:
	Empty blocks implemented, minor bugs and documentation corrections.
0.4:
	Too many. (Some of these could be present in ALpha3 too).
	New style of horizontal offset added. 
	New interface for layoutCmd added. 3 styles: 1 element, 7
	elements, 13 elements (last ones recognized, but not supported).
	New style of addline and deletelines.
	Works with Perl.
	First argument to layout callback now contains widget name too. 
	Used in Equation to get width of the screen.
	Deletion works better, now deletes as deep a split as needed.
0.4.1:
	Now patches one file in Tk only. Now recompile of Tk should be
	_very_ quick (reinstall can be slow).
0.4.2:
	One file was (erroneously) a link outside the tree. The rest
	of links should be corrected.
0.4.3:
	A warning for missing file busted the test on different sites.
0.4.4:
	(Under Perl:)  Now the second component of the first argument of
	layoutCallback is not the name of the widget, but actual reference to
	the widget. However, a patch to tkGlue.c is needed. Not released
	because of this.
0.4.5:
	One minor bug corrected, updated to sync with Tk-b8 and tk4.0p1.
	No recompile of Tk is necessary.
0.4.6:
	Selection bug corrected, Tab works again (ListFactoryAppendList 
	added), environment variable `kprefix' denotes prefixes for
	special keys (default `Control-Meta-').
0.4.7:
	Hidden leaves where not hidden from BBox and Measure.
	Perl demo updated (now only the pedestal is missing).
	Doc brushed up by Norm Shelley.
0.5.0:
	Selection and search work. `txtWgt config -getFlags 1' works.
0.5.1:
	Note that case conversion during extraction works with DStrings only. 
	Verbose mode works, making it possible to have Load/Save in
		Perl demo.
	Temporarily verbose output is put on 'block list' subcommand.
	Menubar added to Perl demo. (TeX from selection is not working so far).
	Minimal TeX import added.
0.5.2:
	Minor documentation fixes. Table block coded in Perl demo.
	Algorithm of finding @x,y may return start and end of a block now.
	One could not render a block with data.
	Block insertion could eat the last fake line into block.
	Makefile.PL (for Perl build) updated for Tk-b10-tobe.
0.5.3:
	Warning from gcc -Wall -Wno-comment -Wno-unused corrected.

MarkFindPrev need additional work: there are two modes for going out
of tree: when we did not reach the target position, and when we did.
TkIBTreeLastLine???
TagRootPtr... TkBTreeStartSearch TkBTreePrevTag
Methods.def manually created.

0.6.1:
	Bug with tags togglecount when going out of IBTree corrected.
	Cleaned up Makefile.PL (might break the install if inside Tk tree).

0.6.2:
	Should work inside Tk directory too.