From: Alan Third <alan@idiocy.org>
Date: Thu, 13 Aug 2020 18:00:41 +0000 (+0100)
Subject: Fix slow down when moving between monitors (bug#42834)
X-Git-Tag: emacs-28.0.90~6599
X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=2129d6b9dcc7248ef7f0c17b1367a853b2257bfa;p=emacs.git

Fix slow down when moving between monitors (bug#42834)

* src/nsterm.m ([EmacsView windowDidChangeBackingProperties:]):
Recreate the buffer every time.
---

diff --git a/src/nsterm.m b/src/nsterm.m
index 9f5916d78ed..c1d133a00e5 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -8424,25 +8424,17 @@ not_in_argv (NSString *arg)
 
 
 - (void)windowDidChangeBackingProperties:(NSNotification *)notification
-  /* Update the drawing buffer when the backing scale factor changes.  */
+  /* Update the drawing buffer when the backing properties change.  */
 {
   NSTRACE ("EmacsView windowDidChangeBackingProperties:]");
 
   if (! [self wantsUpdateLayer])
     return;
 
-  CGFloat old = [[[notification userInfo]
-                    objectForKey:@"NSBackingPropertyOldScaleFactorKey"]
-                  doubleValue];
-  CGFloat new = [[self window] backingScaleFactor];
-
-  if (old != new)
-    {
-      NSRect frame = [self frame];
-      [self createDrawingBuffer];
-      ns_clear_frame (emacsframe);
-      expose_frame (emacsframe, 0, 0, NSWidth (frame), NSHeight (frame));
-    }
+  NSRect frame = [self frame];
+  [self createDrawingBuffer];
+  ns_clear_frame (emacsframe);
+  expose_frame (emacsframe, 0, 0, NSWidth (frame), NSHeight (frame));
 }
 #endif /* NS_DRAW_TO_BUFFER */