Window actor leaked when window is destroyed with a pending maximise operation
A window actor can become stuck on-screen if, for example, a GTK application crashes during the emission of GdkFrameClock::layout in response to super+arrow-key.
Attached is a minimal program to display a visible GDK window. Maximising the window (using super+left, for instance) and then killing the application with ^C doesn't result in the window actor being destroyed.