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	one-line windows are the minibuffer, or that all minibuffers are
	one line high.  Use MINI_WINDOW_P.

	* window.c (change_window_height): If the size of the window will
	shrink below the minimum, this code would only try to delete it if
	it had a parent.  Well, even if the window doesn't have a parent,
	you want Fdelete_window to signal an error, since you're trying to
	resize one of the undeleteable windows into nothingness.  So call
	Fdelete_window even if the window doesn't have a parent.

	* window.c (MINSIZE): Add kludge so that the minibuffer is always
	allowed to shrink to one line in height.
	(MINSIZE, CURBEG, CURSIZE): Change these so that their argument
	are always Lisp_Objects, not struct window *'s.
	(change_window_height): Changed accordingly.