Prevent redrawing if frame is garbaged

* src/nsterm.m ([EmacsView viewWillDraw]): Cancel drawing if the frame
has been garbaged.
* src/xdisp.c (expose_window_tree, expose_frame): Remove NS only
exceptions.

src/nsterm.m

@@ -8077,6 +8077,14 @@ - (instancetype)toggleToolbar: (id)sender
 }
 
 
+- (void)viewWillDraw
+{
+  /* If the frame has been garbaged there's no point in redrawing
+     anything.  */
+  if (FRAME_GARBAGED_P (emacsframe))
+    [self setNeedsDisplay:NO];
+}
+
 - (void)drawRect: (NSRect)rect
 {
   const NSRect *rectList;

src/xdisp.c

@@ -32266,14 +32266,7 @@ expose_window_tree (struct window *w, XRectangle *r)
   struct frame *f = XFRAME (w->frame);
   bool mouse_face_overwritten_p = false;
 
-  /* NS toolkits may have aleady modified the frame in expectation of
-     a successful redraw, so don't bail out here if the frame is
-     garbaged.  */
-  while (w
-#if !defined (HAVE_NS)
-         && !FRAME_GARBAGED_P (f)
-#endif
-         )
+  while (w && !FRAME_GARBAGED_P (f))
     {
       mouse_face_overwritten_p
 	|= (WINDOWP (w->contents)
@@ -32301,16 +32294,11 @@ expose_frame (struct frame *f, int x, int y, int w, int h)
 
   TRACE ((stderr, "expose_frame "));
 
-#if !defined (HAVE_NS)
-  /* No need to redraw if frame will be redrawn soon except under NS
-     where the toolkit may have already modified the frame in
-     expectation of us redrawing it.  */
   if (FRAME_GARBAGED_P (f))
     {
       TRACE ((stderr, " garbaged\n"));
       return;
     }
-#endif
 
   /* If basic faces haven't been realized yet, there is no point in
      trying to redraw anything.  This can happen when we get an expose