bug#32932: 27.0.50; render bugs on macOS Mojave

[Alan Third]

On Thu, Oct 04, 2018 at 07:45:49PM +0100, Alan Third wrote:
> You lost the bug tracker again.
> 
> On Thu, Oct 04, 2018 at 11:34:41AM -0700, Aaron Jensen wrote:
> > On October 4, 2018 at 11:25:19 AM, Alan Third
> > (alan@idiocy.org(mailto:alan@idiocy.org)) wrote:
> > 
> > > Is it possible that ‘one line’ is the same as the height of the title
> > > bar?
> > 
> > That’s possible, yes.
> > 
> > > Sorry, I was unclear. I meant the compiler warnings etc. But since
> > > Charles sees this on 10.6 it’s unlikely it’s something new in the
> > > compilation.
> > >
> > > All I can think of to do is enable NSTRACE and see if you can spot
> > > some commonality when the problem happens.
> > 
> > Any particular groups you want me to include in the trace?
> 
> No. It’s possible that updates and focus could give some extra clue,
> but they also might just end up littering the output with nonsense.

Can you try the attached patch? I noticed that nested calls to
ns_clip_to_row would probably fail to reset the graphics context
correctly (and therefore the clipping areas for drawing). I’ve no idea
if that’s actually a problem for us, though.
-- 
Alan Third

0001-Fix-occasional-redraw-error-bug-32932.patch
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