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macOS: Fix crash after close a fullscreen window.

Suyuan Chang requested to merge suyuan/gtk:suyuan/fix-macos-crash-close-fullscreen-window into gtk-3-24

This crash only happens when user closes a fullscreen window. GTK finalized it's impl object GdkWindowImplQuartz after receiving windowWillClose: . But the GdkQuartzNSWindow is not deleted yet at that time, it will receive setStyleMask: after windowWillClose.

In that case, GTK will call _gdk_quartz_window_update_fullscreen_state() and access finalized GdkWindowImplQuartz object and cause crash.

Edited by Suyuan Chang

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