From c9f6f86814165ae277fe1618135151d0cdf84b8e Mon Sep 17 00:00:00 2001
From: Alan Third <alan@idiocy.org>
Date: Fri, 11 Jan 2019 16:52:59 +0000
Subject: 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 | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'src/nsterm.m')

diff --git a/src/nsterm.m b/src/nsterm.m
index c09f684daf4..bbd2c84214c 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -8077,6 +8077,14 @@ not_in_argv (NSString *arg)
 }
 
 
+- (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;
-- 
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