Moves the window out of fullscreen mode. If the window was not fullscreen, does nothing.
On X11, asks the window manager to move
window out of the fullscreen
state, if the window manager supports this operation. Not all
window managers support this, and some deliberately ignore it or
don't have a concept of "fullscreen"; so you can't rely on the
unfullscreenification actually happening. But it will happen with
most standard window managers, and GDK makes a best effort to get
it to happen.
Derived by RGtkGen from GTK+ documentation
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