Move the orientation change handling to the display manager and call it from the relevant places to repeated and scattered code for the same functionality. Bring back part of 072387edecb2269097821e35f1f232da6c657650 which checks discard a resize event that's not valid that reports not up to date layout size. If DisplayManager.DisplayListener.onDisplay() initiates the orientation change, handle it immediately if we don't expect the size to change, i.e. if the orientation is changing from portrait to inverted portrait and vise versa for landscape. Otherwise, expect the change to be initiated again shortly after from QtLayout.onSizeChanged(). Also, add improve the unit test of the orientation change, and test for the widget size after such changes to make sure QTBUG-94459 is not reached again. Fixes: QTBUG-119430 Task-number: QTBUG-115019 Task-number: QTBUG-94459 Change-Id: I5f060d91531af677ddf891f2af360d5f399e26e5 Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org> Reviewed-by: Ville Voutilainen <ville.voutilainen@qt.io>