* xdisp.c (redisplay): Call FRAME_SAMPLE_VISIBILITY to set the

* xdisp.c (redisplay): Call FRAME_SAMPLE_VISIBILITY to set the
	visible and iconified flags appropriately for each frame.
	(message1): Call FRAME_SAMPLE_VISIBILITY to set the visible and
	iconified flags for the minibuffer frame.

	* xdisp.c (redisplay): Use FOR_EACH_FRAME to apply
	redisplay_windows to the root window of each frame.  This makes a
	#ifdef MULTI_FRAME unneeded, but it also means we recompute
	buffer_shared from scratch even on non-MULTI_FRAME configurations.
	Don't skip elements of Vframe_list that aren't frames; go ahead
	and crash here.

	* xdisp.c (redisplay): Remove #ifdef MULTI_FRAME around the code
	which updates separate minibuffer frames specially; there's
	nothing there that won't work on a single-frame configuration.