qt: Add Dark Mode [Closed due to incorrect rebase] Reopened in !6131

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added Component::Interface: Qt Version::3.0.x labels

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db713f7a - Resolved Imports

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d943f010 - Resolved Win Imports

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marked this merge request as draft

Hi, nicely done! Since this is integrating directly into the stable branch, it might take some times and roundtrips so as to check everything and avoid introducing a regression, but I'm pretty sure this will be really appreciated by the users! Thanks for the contribution.

Qt should probably be upgraded to last open source 5.15 with provided additional security patches, and this probably should be done regardless of dark theme before 3.0 branch is deprecated.

Once Qt is upgraded to 5.15, it reportedly [1] provides support for dark theme. There is already an option to change the style, I don't think it's good idea to override the selected style as currently dark mode option and the style option conflict with each other (dark mode force enables Fusion style).

[1] https://www.qt.io/blog/dark-mode-on-windows-11-with-qt-6.5