bug#59094: 29.0.50; ediff-revision flags wrong lines in etc/HELLO

[Mike Kupfer]

From the top level directory of the git repository, running "emacs -Q":

1. C-c C-f etc/HELLO RET

2. M-x ediff-revision RET HELLO RET 0df73dabc16 RET 8721e87a6ec RET

Ediff says there are 6 diffs.  When I move through the diffs (e.g., by
typing SPC in the Ediff control buffer), the first 4 claim that a line
has been added, but that line already exists in the old revision (see
attached screenshot).  These are the lines for Batak, Efik, Hanifi
Rohingya, and Rejang.

Furthermore, ediff does not flag lines that actually are new: Adlam,
Coptic, Gothic, Mende Kikakui, and Wancho.  Nor does it catch the change
to Ukrainian.

Here's what I get after saving the 2 Ediff buffers to files and then
comparing with diff:

26a27
> Adlam (𞤀𞤣𞤤𞤢𞤥) 𞤅𞤢𞤤𞤢𞥄𞤥
42a44
> Coptic (ⲘⲉⲧⲢⲉⲙ̀ⲛⲭⲏⲙⲓ) Ⲛⲟⲩϥⲣⲓ
58a61
> Gothic (𐌲𐌿𐍄𐌹𐍃𐌺𐌰)      𐌷𐌰𐌹𐌻𐍃 / 𐌷𐌰𐌹𐌻𐌰
86a90
> Mende Kikakui (𞠀𞠁𞠂)   𞠛𞠉
114c118
< Ukrainian (українська)        Вітаю
---
> Ukrainian (українська)        Вітаю / Добрий день! / Привіт
116c120
< 
---
> Wancho (𞋒𞋀𞋉𞋃𞋕)        𞋂𞋈𞋛


The revision hash below includes some changes to MH-E and to the
function move-file-to-trash.  It is based on 8721e87a6ec.

regards,
mike

In GNU Emacs 29.0.50 (build 3, x86_64-pc-linux-gnu, X toolkit, cairo
 version 1.16.0, Xaw scroll bars) of 2022-11-06 built on alto
Repository revision: f749a1dd7875a83e6415d8c512c5659f0f23c834
Repository branch: master-mdk
Windowing system distributor 'The X.Org Foundation', version 11.0.12011000
System Description: Debian GNU/Linux 11 (bullseye)

Configured using:
 'configure --prefix=/usr/new'

Configured features:
CAIRO FREETYPE GIF GLIB GMP GNUTLS GSETTINGS HARFBUZZ JPEG LIBSELINUX
LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG SECCOMP SOUND THREADS TIFF
TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM LUCID ZLIB

Important settings:
  value of $LC_TIME: C
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Lisp Interaction

Minor modes in effect:
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Load-path shadows:
None found.

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hashtable-print-readable backquote threads inotify dynamic-setting
system-font-setting font-render-setting cairo x-toolkit x multi-tty
make-network-process emacs)

Memory information:
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 (symbols 48 29639 15)
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