Cosmic: No window decorations for Qt6 and KDE applications

I am using Cosmic Desktop 1.0.0.beta.1.1-1. When I use Qt applications (e.g. FeatherPad, LazarusQt, etc.) or KDE applications (e.g. Kate, Dolphin, etc.), the windows have no decoration, i.e. no title bar for moving the window and no buttons for closing, minimising, maximising or resizing.

What could be the reason for this? I would like to use Cosmic Desktop as an alternative to Plasma, which I normally use, but I need various KDE and Qt programs that are only of limited use due to the lack of window decoration.

Because of this:

TLDW: The dreaded server side vs. client side decorations dilemma (also it’s still beta).

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Well then, I hope that this problem will be fixed by the time the first final version is released (scheduled for mid-December).

Otherwise, Cosmic would simply be unusable, which would be a shame. They really need to come up with something.

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