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	configuration of a dead frame, don't bother rebuilding its window
	tree, restoring its focus redirection, or temporarily resizing it
	to fit the saved window configuration.  If the frame which was
	selected when the configuration was captured is now dead, don't
	try to select it.

	* frame.c (Fdelete_frame): Delete all the windows in the frame's
	window tree, using delete_all_subwindows.
	* window.c (delete_all_subwindows): Don't make this static
	anymore.