[policykit-kde-agent-1] [Bug 485937] New: polkit-kde-authentication-agent-1 crashes, if QT style is overridden (QT_STYLE_OVERRIDE), only Fusion works

[Fabian Arndt]

https://bugs.kde.org/show_bug.cgi?id=485937

            Bug ID: 485937
           Summary: polkit-kde-authentication-agent-1 crashes, if QT style
                    is overridden (QT_STYLE_OVERRIDE), only Fusion works
    Classification: Plasma
           Product: policykit-kde-agent-1
           Version: 6.0.3
          Platform: Fedora RPMs
                OS: Linux
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: fabian.arndt at root-core.net
                CC: drf at kde.org, jgrulich at redhat.com, jreznik at redhat.com
  Target Milestone: ---

Created attachment 168779
  --> https://bugs.kde.org/attachment.cgi?id=168779&action=edit
Stack trace

SUMMARY

It crashed, if the specified theme is not present/accessible (?). The only
working Theme is "Fusion".
This is happened on hyprland, as I was testing polkit with it. Nonetheless, it
should not crash.


STEPS TO REPRODUCE

1. Run "QT_STYLE_OVERRIDE=Adwaita-Dark
/usr/libexec/kf6/polkit-kde-authentication-agent-1"
2. Open a program that requests elevated rights (rg. partitionmanager)


OBSERVED RESULT

Crash. Some stdout output:

> QQmlApplicationEngine failed to load component
> qrc:/qml/QuickAuthDialog.qml: module "Adwaita-Dark" is not installed
> KCrash: appFilePath points to nullptr!
> KCrash: Application '<unknown>' crashing... crashRecursionCounter = 2
> Segmentation fault


EXPECTED RESULT

No crash and a themed dialog that elevated rights.


SOFTWARE/OS VERSIONS

CAUTION: I was using hyprland!

Linux: Nobara Linux 39
KDE Plasma Version: 6.0.3
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2


ADDITIONAL INFORMATION

If you enter something random as QT_STYLE_OVERRIDE, it does not crash. It
instead tells you which styles could be used and falls back to Fusion.

> Available styles: Breeze, qt5ct-style, qt6ct-style, HighContrastInverse, HighContrast, Adwaita-HighContrastInverse, Adwaita-HighContrast, Adwaita-Dark, Adwaita, Windows, Fusion

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