3b3960c9b4
If a widget received a DragEnter event that it didn't accept, then the UnderMouse widget attribute gets set. But the drag manager never got a drag target, so the DragLeave event was never delivered, leaving the UnderMouse attribute set incorrectly. We always need to send DragLeave events to the receiver, even if the DragEnter or DragMove was not accepted. Otherwise we are not in balance, and the UnderMouse attribute will remain set. This is a change of behavior and a very old bug, so only fixing this in unreleased branches. Test case added to verify that explicitly generated drag events result in the correct enter/leave events. [ChangeLog][QtWidgets][QWidget] DragLeave events are now always sent to the widget the mouse is leaving, even if it didn't accept the DragEnter event. Fixes: QTBUG-50403 Change-Id: I5eae49da000fb4fea81f1767f0e73a06a6b78975 Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io> Reviewed-by: Christian Ehrlicher <ch.ehrlicher@gmx.de> Reviewed-by: Axel Spoerl <axel.spoerl@qt.io> (cherry picked from commit 4f95e66f940c3a6c72f51c2428620c09e30bbd0b) Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>