To reproduce this bug, you have to throw the window very fast under the panel with the mouse. If you simply try to drop it slowly, it won't be reproducible. It will generally happens when a window try restore over the panel or if you do a bad and fast move.
To reproduce this bug, you have to throw the window very fast under the panel with the mouse. If you simply try to drop it slowly, it won't be reproducible. It will generally happens when a window try restore over the panel or if you do a bad and fast move.