Description:
Very silly/unimportant bug, but previewing my keyboard layout (modified) in systemsettings5, one key is not displayed correctly:
I get "Ú" (Unicode U+DA (hexa)) INSTEAD OF "°" (dead_abovering) in the previewer (tastenbrett 1.0)
whereas the keyboard types the correct layout "°" (dead_abovering)

Additional info:
* package version(s)
* config and/or log files etc.
* link to upstream bug report, if any
(from https://wiki.archlinux.org/index.php/Bug_reporting_guidelines (should give more tips to find answers to this questions))
Version of the program: tastenbrett 1.0
Version of the package: plasma-desktop 5.21.4-1
Version of the main libraries used by the package: don't know how to answer
Version of the
kernel: uname -a : Linux xxx 5.11.16-arch1-1 #1 SMP PREEMPT Wed, 21 Apr 2021 17:22:13 +0000 x86_64 GNU/Linux
desktop: plasmashell -v : plasmashell 5.21.4
Whether or not the functionality worked at one time or not: unknown
Hardware brand : Asus VivoBook 14 if necessary
Relevant log information:
systemd journal: irrelevant
~/.local/share/xorg/Xorg.0.log or /var/log/Xorg.0.log or /var/log/Xorg.2.log : see attached files
In a console and use verbose and/or debug : no debug/verbose mode : /usr/bin/tastenbrett --model asus_laptop --layout fr --variant latin9 --options -title Français \(obsolète, variante\) :
no output (except the window obviously)
command line options obtained by 'ps aux | grep tastenbrett'
How to reproduce the bug : see 'Steps to reproduce:' further
The stack trace : (https://wiki.archlinux.org/index.php/Debug_-_Getting_Traces#Getting_the_trace) : see attached file

Steps to reproduce:
in /usr/share/X11/xkb/symbols/fr, replace a key code by "dead_abovering" (see my /usr/share/X11/xkb/symbols/fr file, modified from original.)
in kde-plasma, launch /usr/bin/systemsettings5 → Input Devices → Keyboard → Layouts → select fr → variant Français (obsolète, variante) → press "preview" (launches /usr/bin/tastenbrett --model asus_laptop --layout fr --variant latin9 --options -title Français \(obsolète, variante\))
→ TASTENBRETT SHOWS "Ú" (Unicode U+DA (hexa)) INSTEAD OF "°" (dead_abovering)
→ BUT USING KEYBOARD WITH THIS LAYOUT, YOU GET dead_abovering.
if you use my file, the key is "=" ("=/+/}/°" if using nothing/shift/altgr/shift+altgr modifier key)
line 88: key <AE12> { [ equal, plus, braceright, dead_abovering ] };

attached files:
relevant log informations.txt
trace.log
my /usr/share/X11/xkb/symbols/fr file, modified from original.

Hope this will help, even if it's not the biggest bug in history (or maybe it's not a bug, it's a feature, who knows)