Bug#1024604: konsole: dose not show combining characters right

["Mr. T" <t@treaki.tk>]

Package: konsole
Version: 4:20.12.3-1
Severity: important
X-Debbugs-Cc: t@treaki.tk

Dear Maintainer,


   * What led up to the situation?
    trying about whith german Umlauten encoded with combining characters
   * What exactly did you do (or not do) that was effective (or
     ineffective)?
    i created a textfile that displays right in firefox, libreoffice and
    xterm, but wrong in gnome-terminal, gedit and konsole
   * What was the outcome of this action?
    i was confused on what software implements it right which wrong
    (guessing firefox, soffice and xterm doing it right but your modern
    open source stuff wrong, but am not sure)
   * What outcome did you expect instead?
    that all software would display it the same

see attatched screenshots and text file

thanks for looking in to this and hopefully fixing it

PS: see also bug regarding gome-terminal with same issue

-- System Information:
Debian Release: 11.5
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 5.10.0-19-amd64 (SMP w/4 CPU threads)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages konsole depends on:
ii  kio                    5.78.0-5
ii  konsole-kpart          4:20.12.3-1
ii  libc6                  2.31-13+deb11u5
ii  libkf5configcore5      5.78.0-4
ii  libkf5configwidgets5   5.78.0-2
ii  libkf5coreaddons5      5.78.0-4
ii  libkf5crash5           5.78.0-3
ii  libkf5dbusaddons5      5.78.0-2
ii  libkf5globalaccel-bin  5.78.0-3
ii  libkf5globalaccel5     5.78.0-3
ii  libkf5i18n5            5.78.0-2
ii  libkf5iconthemes5      5.78.0-2
ii  libkf5kiowidgets5      5.78.0-5
ii  libkf5notifyconfig5    5.78.0-2
ii  libkf5widgetsaddons5   5.78.0-2
ii  libkf5windowsystem5    5.78.0-2
ii  libkf5xmlgui5          5.78.0-2
ii  libqt5core5a           5.15.2+dfsg-9
ii  libqt5gui5             5.15.2+dfsg-9
ii  libqt5widgets5         5.15.2+dfsg-9
ii  libstdc++6             10.2.1-6

konsole recommends no packages.

Versions of packages konsole suggests:
pn  lrzsz  <none>

-- no debconf information

das hält mich nicht auf
doch das hier hält mich immer auf