[kde] [Bug 490133] New: Some newer KDE apps don't support Oxygen properly – the window background is solid instead of gradient

[Piotr Doroszewski]

https://bugs.kde.org/show_bug.cgi?id=490133

            Bug ID: 490133
           Summary: Some newer KDE apps don't support Oxygen properly –
                    the window background is solid instead of gradient
    Classification: I don't know
           Product: kde
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: piotrekd at vivaldi.net
  Target Milestone: ---

Created attachment 171588
  --> https://bugs.kde.org/attachment.cgi?id=171588&action=edit
solid vs gradient, buggy vs correct

SUMMARY

Some of the newer (or rewritten) KDE applications don't support the Oxygen
theme, default in the KDE 4 line and still shipped with KDE Plasma, properly.
When this theme is used, Qt windows should have gradient backgrounds to
prettily match the window bar.

STEPS TO REPRODUCE
1. Enable the Oxygen window theme in System settings > Colors & Themes >
Application Style
2. Run Spectacle, Skanpage, Elisa… or just restart System settings.

OBSERVED RESULT
A solid gray color is used for the background.

EXPECTED RESULT
A gradient matching the window title bar should be used for the background.

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: openSUSE Tumbleweed
(available in About System)
KDE Plasma Version: 6.1.1
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.2

ADDITIONAL INFORMATION
The problem doesn't exist in external (non-KDE) Qt applications (LXQt or other)
unless they decide to use their own theming independent from the system-wide
one.

Maybe this is related to the new Kirigami framework, but I am not sure.

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