qt: re-enable using top-level window for tool tip on Wayland with Qt 6.9.1

The behavior seems fine to me with Qt 6.9.0-beta3 and KWin Wayland 6.3.1.

Unfortunately there is a regression that the window x can no longer be negative (QTBUG-135158) with regard to the interface window, but that is not relevant to QTBUG-131899. This regression is expected to be fixed by the latest Qt 6.9.1.

We had to disable this feature on Wayland because it was too buggy (tool tip getting bugged and never shown again: QTBUG-131899) with Qt 6.8 (!6398 (merged)).

Request review @chub.

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• 6719ed5e...32412f31 - 24 commits from branch videolan:master
• 38e3a2af - qt: re-enable using top-level window for tool tip on Wayland with Qt 6.9.1

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