bug#42064: 28.0.50; German "Sharp S" is capitalized inconsistenly

[Philip K.]

The german "Sharp S" (ß), seems to be capitalized inconsistenly,
depending on the system:

- The german postfix input method, typing "SZ" inserts "ẞ"
- If a buffer already contains a "ß", running upcase-dwim generates
  "SS". Lowercasing this results in "ss" unsurprisingly, while "ẞ"
  generates "ß".

Both behaviours are fine in their own right, but don't seem to make a
lot of sense together.



In GNU Emacs 28.0.50 (build 5, x86_64-pc-linux-gnu, GTK+ Version 3.24.5, cairo 
version 1.16.0)
 of 2020-06-24 built on bulbul
Repository revision: 9bff3127d70a220e8b63aaf89dce2d5e9e66b0f6
Repository branch: master
Windowing system distributor 'The X.Org Foundation', version 11.0.12004000
System Description: Debian GNU/Linux 10 (buster)

Recent messages:
Type C-c C-c to finish, or C-c C-k to cancel
Saving file /home/phi/code/elisp/dumb-jump/.git/COMMIT_EDITMSG...
Wrote /home/phi/code/elisp/dumb-jump/.git/COMMIT_EDITMSG
Git finished
Running git push -v origin master:refs/heads/master
Quit
Git finished
Quit
Mark set
View mode: type C-h for help, h for commands, q to quit.

Configured using:
 'configure 'CFLAGS=-Wall -Wextra -Wformat -Wformat-security''

Configured features:
XPM JPEG TIFF GIF PNG RSVG CAIRO SOUND GPM DBUS GSETTINGS GLIB NOTIFY
INOTIFY ACL LIBSELINUX GNUTLS LIBXML2 FREETYPE HARFBUZZ M17N_FLT LIBOTF
ZLIB TOOLKIT_SCROLL_BARS GTK3 X11 XDBE XIM MODULES THREADS LIBSYSTEMD
PDUMPER LCMS2 GMP

Important settings:
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Major mode: Markdown

Minor modes in effect:
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  auto-fill-function: do-auto-fill
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Load-path shadows:
/home/phi/.emacs.d/elpa/swiper-0.13.0/swiper hides 
/home/phi/.emacs.d/elpa/ivy-0.13.0/swiper

Features:
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Memory information:
((conses 16 1004119 173255)
 (symbols 48 78455 1)
 (strings 32 340391 34833)
 (string-bytes 1 11933058)
 (vectors 16 123417)
 (vector-slots 8 2642525 213470)
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 (intervals 56 37213 1474)
 (buffers 992 144))

-- 
        Philip K.