From 283f98353fe3549ac8f66a3ab8fba85d93c81a88 Mon Sep 17 00:00:00 2001
From: Alan Third <alan@idiocy.org>
Date: Fri, 19 Feb 2021 19:25:39 +0000
Subject: [PATCH] Fix frame contents scaling bug on macOS (bug#46155)

Discussion in bug#46406.

* src/nsterm.m ([EmacsView focusOnDrawingBuffer:]): Set the scale
factor for the backing layer.
---
 src/nsterm.m | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/nsterm.m b/src/nsterm.m
index b0cf5952fd5..6551694abee 100644
--- a/src/nsterm.m
+++ b/src/nsterm.m
@@ -8377,6 +8377,11 @@ not_in_argv (NSString *arg)
       surface = [[EmacsSurface alloc] initWithSize:s
                                         ColorSpace:[[[self window] colorSpace]
                                                      CGColorSpace]];
+
+      /* Since we're using NSViewLayerContentsRedrawOnSetNeedsDisplay
+         the layer's scale factor is not set automatically, so do it
+         now.  */
+      [[self layer] setContentsScale:[[self window] backingScaleFactor]];
     }
 
   CGContextRef context = [surface getContext];
-- 
2.39.2