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Replace checking if the NSView is really a GdkWindow, which will crash in the likely event it's not a GObject, with ensuring that the parent GdkWindow is really a GdkWindowQuartz.
57170482
Replace checking if the NSView is really a GdkWindow, which will crash in the likely event it's not a GObject, with ensuring that the parent GdkWindow is really a GdkWindowQuartz.