bug#23412: 25.1.50; GUI Emacs on Mac OS X: text is keeping shaking/re-displaying when insert text with external input method

[Eli Zaretskii]

> Date: Sat, 21 Dec 2019 22:54:23 +0000
> From: Alan Third <alan@idiocy.org>
> Cc: HaiJun Zhang <netjune@outlook.com>, 23412@debbugs.gnu.org
> 
> This sounds good. I’m unsure if it still qualifies for copyright
> exemption as it looks to me like 18 lines changed. Eli?

The last part just moves the same code and changes a comment, so I
think we are good with accepting this.

Thanks.