In any case, I asked for a C-level backtrace when I responded to your original report.  Can you please attach a debugger to Emacs after selecting the previously iconified frame, and show such a backtrace?  Please do that with an unpatched Emacs and in "emacs -Q".

Thanks.


On August 4, 2020 5:21:21 AM GMT+03:00, Eli Zaretskii <eliz@gnu.org> wrote:
>> From: Tino Calancha <tino.calancha@gmail.com>
>> Date: Mon, 3 Aug 2020 21:46:49 +0200 (CEST)
>> cc: Tino Calancha <tino.calancha@gmail.com>, 42655@debbugs.gnu.org, 
>>     eggert@cs.ucla.edu, monnier@iro.umontreal.ca,
>uyennhi.qm@gmail.com
>> 
>> How about in Windows? Have you seen this bug?
>
>No, nothing like that.

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