bug#43812: 28.0.50; segfault in ns_clear_under_internal_border

[Sean Farley]

Alan Third <alan@idiocy.org> writes:

> On Sun, Oct 04, 2020 at 09:30:04PM -0700, Sean Farley via Bug reports for GNU 
> Emacs, the Swiss army knife of text editors wrote:
>>
>> (apologies if this is sent twice, I got a bounce back on the first
>> attempt)
>>
>> This one is difficult to figure out. I can reproduce it reliably in my
>> setup but I don't know how to find a minimal working example.
>>
>> The segfault is triggered for me in the following manner:
>>
>> - trigger a company popup in lisp for a library not yet loaded (for me
>>   it was mu4e; only the autoloads existed)
>> - load said library
>> - trigger another company popup for said library
>> - segfault
>
> This is a bit of a shot in the dark, but does the attached patch fix
> it?

Thanks for the quick reply! After a series of manual tests, I think I
can say that, yes, this patch seems to fix the segfault. One thing I
noted is that I had to distclean and reconfigure to get the state of the
bug to appear / disappear. But perhaps that is an artifact of me using
the native-comp branch (or maybe my lack of how object files are
recompiled into Emacs.app)

Either way, much appreciated for the quick fix!