bug#66379: 29.1.50; ediff wordwise ediff-copy-diff leads to different buffers

bug#66379: 29.1.50; ediff wordwise ediff-copy-diff leads to different buffers

[Felix Mühlenberend via Bug reports for GNU Emacs, the Swiss army knife of text editors]

Symptoms:
Diffing the following regions with wordwise mode:
```[A]
This, is a test
```
```[B]
This is a test
```
and copying with (ediff-copy-A-to-B) results in:
```[A]
This, is a test
```
```[B]
This ,is a test
```
Where the comma is in the wrong place.

Actions (I have reproduced this with a vanilla emacs config):
1. Open two buffers and insert the texts
2. Call (ediff-regions-wordwise) and select the two lines in the buffers
3. Call (ediff-copy-A-to-B) and notice the difference

Additional informaiton:
- "," is split as a single word and then diff rightly detects this as a
somewhere in ediff-extract-diffs but I don't have the time to tig in 
further
- This problem can be "fixed" by settings ediff-word-1 to "-[:word:]_,"
including the comma with the word its at


In GNU Emacs 29.1.50 (build 1, x86_64-redhat-linux-gnu, GTK+ Version
3.24.38, cairo version 1.17.8) of 2023-09-13 built on fedora
Repository revision: 9396d73942e0c912d978c25f9883e51668d33255
Repository branch: emacs-29
System Description: Fedora Linux 38 (Workstation Edition)

Configured using:
'configure --prefix=/home/felix/.local --without-pop --with-mailutils
--with-pgtk --without-x --with-xwidgets --with-cairo
--without-compress-install --with-native-compilation --with-json
--with-dbus --with-gif --with-jpeg --with-png --with-rsvg --with-tiff
--with-webp --with-gpm --with-modules --with-harfbuzz
build_alias=x86_64-redhat-linux-gnu host_alias=x86_64-redhat-linux-gnu'

Configured features:
ACL CAIRO DBUS FREETYPE GIF GLIB GMP GNUTLS GPM GSETTINGS HARFBUZZ JPEG
JSON LIBOTF LIBSELINUX LIBSYSTEMD LIBXML2 MODULES NATIVE_COMP NOTIFY
INOTIFY PDUMPER PGTK PNG RSVG SECCOMP SOUND SQLITE3 THREADS TIFF
TOOLKIT_SCROLL_BARS TREE_SITTER WEBP XIM XWIDGETS GTK3 ZLIB

Important settings:
value of $LANG: en_US.UTF-8
value of $XMODIFIERS: @im=ibus
locale-coding-system: utf-8-unix

Major mode: Org

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eros-mode: t
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persp-mode: t
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treemacs-filewatch-mode: t
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override-global-mode: t
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apheleia-global-mode: t
apheleia-mode: t
global-eldoc-mode: t
eldoc-mode: t
electric-indent-mode: t
mouse-wheel-mode: t
prettify-symbols-mode: t
file-name-shadow-mode: t
global-font-lock-mode: t
font-lock-mode: t
window-divider-mode: t
size-indication-mode: t
column-number-mode: t
line-number-mode: t
global-visual-line-mode: t
visual-line-mode: t
transient-mark-mode: t
auto-composition-mode: t
auto-encryption-mode: t
auto-compression-mode: t

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Memory information:
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(string-bytes 1 15150881)
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bug#66379: 29.1.50; ediff wordwise ediff-copy-diff leads to different buffers

[Michael Heerdegen]

Felix Mühlenberend via "Bug reports for GNU Emacs, the Swiss army knife
of text editors" <bug-gnu-emacs@gnu.org> writes:

> Symptoms:
> Diffing the following regions with wordwise mode:
> ```[A]
> This, is a test
> ```
> ```[B]
> This is a test
> ```
> and copying with (ediff-copy-A-to-B) results in:
> ```[A]
> This, is a test
> ```
> ```[B]
> This ,is a test
> ```
> Where the comma is in the wrong place.

This is not the only case of such things happening.  The wordwise mode
is more or less whitespace agnostic, it doesn't care when copying
between the buffers.

AFAIR I did not have a good idea to fix this yet.  Of course one can
mess with the word classes to fix some special cases (but never all), I
even tried to make whitespace a separate class, but nothing ever worked
reliably.

Michael.