Setting Qt::WA_NativeWindow on any main window sub-widget (QDockWidget contents, central widget) breaks QDockWidget undocking and docking behaviors.

Problem 1 :

• When the dockWidget is undocked, it immediately becomes unresponsive to drag mouse movement
• When the mouse button is released the window then starts dragging

Problem 2:

• A floating dockWidget cannot be docked by dragging to the docking area.
• It requires to click the docking area.

How to reproduce :
Use attached sample project qtbug93064.zip ( Setting attribute Qt::WA_NativeWindow to https://doc.qt.io/qt-5/qtwidgets-mainwindows-dockwidgets-example.html )

• Uncomment any of "setAttribute( Qt::WA_NativeWindow, true);" in mainwindow.cpp
• Try to undock and dock the windows