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Bug
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    Resolution: Fixed
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P1: Critical
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    6.5
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    None
 
To reproduce, run any application with dock widgets.
Unplug a dock widget from the main dock.
Drag the main window at it's title bar and hover it over the dock widget.
Expected behavior:
Main window stays on top of the Z-order.
Actual behavior:
Main window slides behind the dock widget.
Regression since 6.5, no workaround.
Found by benjamin.hadra