QWidget windows with WindowStaysOnTopHint can go under the status pane's windows

It's difficult to control if a QWidget with the window flag Qt::Window will be on top of the status pane or under it. Depending on the order of showing the windows the results can vary.

Even after specifying the window flag Qt::WindowStaysOnTopHint the QWidget's window still can go under the windows of the status pane. The attached application can be used to reproduce the problem.

The attached screenshots show how after starting the application in the portrait orientation the QWidget's red window can be partly seen but is mostly under the windows of the status pane area. After switching the screen orientation to landscape by rotating the device more of the QWidget's window is visible.