Programmatic color scheme change in QKdeTheme

[Axel Spoerl]

Hi KDE folks,

Qt 6.8 has implemented QPlatformTheme::requestColorScheme() as a virtual function. It is meant to allow a programmatic color scheme change within a QGuiApplication. If the system's theme is dark, the application can still be light and vice versa.
https://codereview.qt-project.org/c/qt/qtbase/+/628010 re-implements this function in QKdeTheme. In case of a deviation (requested color scheme != system color scheme), it falls back to a fusion palette (of which a dark and a light version exist).

The patch is tested, but not yet approved. I'd highly appreciate your reviews.

Cheers
Axel

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