[dolphin] [Bug 458865] After an update to qt5-base the dolphin file picker dialog used in GTK applications via GTK_USE_PORTAL=1 ignores theming

[bugzilla_noreply at kde.org]

https://bugs.kde.org/show_bug.cgi?id=458865

--- Comment #6 from moritz1000 at googlemail.com ---
(In reply to Antonio Rojas from comment #4)
> There have been reports of xdg-desktop-portal-kde crashing when updating
> qt5-base to the latest commit. I'm pretty sure this is what happened here,
> if you could dig in your coredumpctl and post a backtrace it would be quite
> useful.

Does this help? I have never done this. I followed:
https://wiki.archlinux.org/title/Core_dump#Examining_a_core_dump

I used Timeshift to go back before the qt5-base update was installed, installed
it, rebooted and opened Firefox and invoked a `Save As - Portal` dialog from
Firefox (which was not dark themed & missing icons again).

I opened a terminal:

1) sudo coredumpctl list 
2) there was an entry: Thu 2022-09-08 14:02:53 CEST   912  970  970 SIGABRT
present  /usr/lib/xdg-desktop-portal-kde
3) sudo coredumpctl gdb 912
4) (gdb) bt:

(gdb) bt
#0  0x00007fb890aa14dc in ?? () from /usr/lib/libc.so.6
#1  0x00007fb890a51998 in raise () from /usr/lib/libc.so.6
#2  0x00007fb890a3b53d in abort () from /usr/lib/libc.so.6
#3  0x00007fb89109fede in QMessageLogger::fatal(char const*, ...) const () from
/usr/lib/libQt5Core.so.5
#4  0x00007fb891d3c9b5 in QGuiApplicationPrivate::createPlatformIntegration()
() from /usr/lib/libQt5Gui.so.5
#5  0x00007fb891d3d019 in QGuiApplicationPrivate::createEventDispatcher() ()
from /usr/lib/libQt5Gui.so.5
#6  0x00007fb891292fab in QCoreApplicationPrivate::init() () from
/usr/lib/libQt5Core.so.5
#7  0x00007fb891d3d0c9 in QGuiApplicationPrivate::init() () from
/usr/lib/libQt5Gui.so.5
#8  0x00007fb892b75e2e in QApplicationPrivate::init() () from
/usr/lib/libQt5Widgets.so.5
#9  0x00005637bcce60c6 in ?? ()
#10 0x00007fb890a3c2d0 in ?? () from /usr/lib/libc.so.6
#11 0x00007fb890a3c38a in __libc_start_main () from /usr/lib/libc.so.6
#12 0x00005637bcce7535 in ?? ()
(gdb) Quit

I add the full coredumpctl_gdb _912 command as attachment.

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