bug#39724: 26.3; Commit 44298ea6aa006ed227e539b02279bd3fc11fd2a6 breaks font display on macOS

[Stefan Kangas]

Alan Third <alan@idiocy.org> writes:

> On Tue, Feb 25, 2020 at 10:06:33PM +0100, Alan Third wrote:
>> On Mon, Feb 24, 2020 at 09:56:04AM -0800, John Wiegley wrote:
>> > >>>>> "AT" == Alan Third <alan@idiocy.org> 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:
>> >
>> >     -DMAC_OS_X_VERSION_MAX_ALLOWED=101200
>> >
>> > 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 *)notification
>>      {
>>        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.
>>
>
> Hi John, I don’t know if you tried the above patch, but can you please
> try building the master branch again? I fixed an issue last night that
> may be the same as your problem. I’m not sure because it all depends
> on the build environment and what versions of Cocoa are available and
> so on, and I think Nix may confuse matters.

That was 6 months ago.  Any updates here?

If I don't hear back from you within a couple of weeks, I'll just
assume this has been fixed and close this bug.

Best regards,
Stefan Kangas