[Pkg-kde-extras] Bug#1114479: kdiff3: application window badly displays with "git mergetool"

[Jérôme Pouiller]

Package: kdiff3
Version: 1.12.2-1
Severity: important
X-Debbugs-Cc: jerome.pouiller at gmail.com

I mainly use kdiff3 with 'git mergetool'. Since my migration to trixie, the
kdiff3 window is often badly displayed. I seems like the graphical buffers
were not initialized. This issue makes the application unusable.


I have played a bit with kdiff3. It seems the issue only happen when kdiff3
is invoked with --auto (unfortunately, it is not easy to ask to git to not
use --auto).

If I stop and restart 'git mergetool', the problem is still there. If I
resize the window before to exit the application, the next restart is often
fine. If I run kdiff3 --auto manually, the problem occurs once in two (in a
predictable sequence: ko, ok, ko, ok...).

I use Plasma + wayland. The problem was not here with bookworm. I assume
the issue is related to libqt6, plasma or KDE 6.


-- System Information:
Debian Release: 13.0
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 6.12.41+deb13-amd64 (SMP w/8 CPU threads; PREEMPT)
Locale: LANG=en_IE.utf8, LC_CTYPE=en_IE.utf8 (charmap=UTF-8), LANGUAGE=en_IE:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages kdiff3 depends on:
ii  kio6                  6.13.0-6
ii  libc6                 2.41-12
ii  libgcc-s1             14.2.0-19
ii  libicu76              76.1-4
ii  libkf6configcore6     6.13.0-2
ii  libkf6configwidgets6  6.13.0-1
ii  libkf6coreaddons6     6.13.0-1
ii  libkf6crash6          6.13.0-1
ii  libkf6i18n6           6.13.0-1
ii  libkf6kiocore6        6.13.0-6
ii  libkf6kiowidgets6     6.13.0-6
ii  libkf6widgetsaddons6  6.13.0-1
ii  libkf6xmlgui6         6.13.0-1
ii  libqt6core6t64        6.8.2+dfsg-9
ii  libqt6gui6            6.8.2+dfsg-9
ii  libqt6printsupport6   6.8.2+dfsg-9
ii  libqt6widgets6        6.8.2+dfsg-9
ii  libstdc++6            14.2.0-19

Versions of packages kdiff3 recommends:
ii  kdiff3-doc  1.12.2-1

kdiff3 suggests no packages.

-- no debconf information