bug#30699: 26.0.91; buffer contents flicker on macOS frames when frames are resized

[Eli Zaretskii]

> Date: Mon, 12 Mar 2018 00:46:38 +0000
> From: Alan Third <alan@idiocy.org>
> Cc: 30699@debbugs.gnu.org, aaronjensen@gmail.com
> 
> Am I able to call redisplay whenever I want?

Not sure about "whenever I want" part.

> That is, does calling it ever result in a longjmp?

I think it never longjmps, even on TTYs, where C-g generates SIGINT.
But I may be wrong here.