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bug#39724: 26.3; Commit 44298ea6aa006ed227e539b02279bd3fc11fd2a6 breaks

From: Alan Third
Subject: bug#39724: 26.3; Commit 44298ea6aa006ed227e539b02279bd3fc11fd2a6 breaks font display on macOS
Date: Tue, 25 Feb 2020 22:06:33 +0100 (CET)

On Mon, Feb 24, 2020 at 09:56:04AM -0800, John Wiegley wrote:
> >>>>> "AT" == Alan Third <address@hidden> writes:
> AT> Are you still using Nix to build Emacs? As I recall it used to use the
> AT> 10.10 build environment even on more modern versions of macOS, so this
> AT> could still be an incompatibility between the new drawing code and older
> AT> versions of macOS/XCode.
> I am using Nix, but it passes this:
> Which should be recent enough, I'd think.
> I also need to track down the slowness that I'm seeing, to see which commit
> introduced that. It will take me a few days to gather all of this information,
> given how slow the test cycles are.

Could you try the below patch to see if that sorts the background issue?

modified   src/nsterm.m
@@ -8240,6 +8240,8 @@ - (void)createDrawingBuffer
   /* This fixes the scale to match the backing scale factor, and flips the 
image.  */
   CGContextTranslateCTM(drawingBuffer, 0, NSHeight (frame) * scale);
   CGContextScaleCTM(drawingBuffer, scale, -scale);
+  ns_clear_frame (emacsframe);
@@ -8269,7 +8271,6 @@ - (void)windowDidChangeBackingProperties:(NSNotification 
       NSRect frame = [self frame];
       [self createDrawingBuffer];
-      ns_clear_frame (emacsframe);
       expose_frame (emacsframe, 0, 0, NSWidth (frame), NSHeight (frame));

I don’t know if I’ve just missed it (I’ve been messing with my email
set‐up recently) but I’ve not seen the build log you promised.

Alan Third

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