c0bdb3018b
There's a small window before a window that is being unmanaged is unregistered with the display. The MetaScreen::window-left-monitor and MetaWorkspace::window-removed emissions fall right into that window, so code that runs in that time may well be out of our control; we can make sure that the method it can use to get an updated list of windows no longer contains the destroyed window though, which is a much better option than expecting everyone to filter the list themselves.