bug#40541: 28.0.50; macOS: Cursor color doesn't restore after the frame changes from unfocused to focused

[Stefan Kangas]

HaiJun Zhang <netjune@outlook.com> writes:
> Reproducing steps:
> 1. emacs -Q
> 2. M-x blink-cursor-mode
> 3. menu-->Options-->Set default font-->choose a bigger size
> 4. M-x load-theme light-blue
> 5. switch to other app and then back to Emacs
> 6. The color of the cursor doesn't restore.
> 7. After a mouse click in the emacs frame, the cursor color restores.
>
> In GNU Emacs 28.0.50 (build 1, x86_64-apple-darwin17.7.0, NS appkit-1561.61 
> Version 10.13.6 (Build 17G12034))
> of 2020-04-10 built on jundeMac
> Repository revision: e18c24b35a7cf9bb1b91288b706fa448ed28a7c2
> Repository branch: master
> Windowing system distributor 'Apple', version 10.3.1561
> System Description:  Mac OS X 10.13.6

I can reproduce this.

In GNU Emacs 28.0.50 (build 1, x86_64-apple-darwin17.7.0, NS
appkit-1561.61 Version 10.13.6 (Build 17G10021))
 of 2020-04-25 built on Stefans-MacBook-Pro.local
Repository revision: a98c8f5a098cf646c282be67cce9fb7999d353d7
Repository branch: master
Windowing system distributor 'Apple', version 10.3.1561
System Description:  Mac OS X 10.13.6

Best regards,
Stefan Kangas