bug#49489: 28.0.50; C-z hangs emacs in i3wm

[Ergus via "Bug reports for GNU Emacs, the Swiss army knife of text editors" <bug-gnu-emacs@gnu.org>]

On Sat, Jul 10, 2021 at 06:38:05PM +0200, Lars Ingebrigtsen wrote:
>Ergus <spacibba@aol.com> writes:
>
>> Recently I found that when I send C-z by accident to a gui emacs in i3wm
>> it hangs until I select another window and select it back again.
>
>Just to confirm that it's indeed the iconification that makes Emacs
>hang, can you try
>
>M-: (iconify-frame) RET
>
>?
>
Confirmed! Just tried and this makes it hang.

>> i3wm does not support minimize windows, most of the applications just
>> ignore when the user tries to minimize; but don't hang. (Something that
>> does not happen very often either because most of the users disable the
>> window borders)
>>
>> Is it possible to detect when the window manager does not support
>> minimize or that the frame was not really minimized?
>
>I think the window manager can announce whether it supports
>iconification or not, but I'm not very familiar with that stuff myself.
>Anybody else know?
>
>-- 
>(domestic pets only, the antidote for overdose, milk.)
>   bloggy blog: http://lars.ingebrigtsen.no