bug#42655: 27.1; iconify-frame on a Lucid build may stuck the frame

[Eli Zaretskii]

> From: Tino Calancha <tino.calancha@gmail.com>
> Date: Thu, 6 Aug 2020 16:37:18 +0200 (CEST)
> cc: Tino Calancha <tino.calancha@gmail.com>, bhavin7392@gmail.com, 
>     42655@debbugs.gnu.org, eggert@cs.ucla.edu, uyennhi.qm@gmail.com, 
>     monnier@iro.umontreal.ca
> 
> > Thanks.  Looks like we never get the MapNotify event from X windows?
> > Can you verify that, either by running the xev utility or by setting a
> > breakpoint in xterm.c:handle_one_xevent when MapNotify is handled, and
> > repeating the recipe?
> 
> Set breakpoint at
> xterm::8348
> C-z ; frame is hidden
> ;; I select again the hidden frame
> ;; gdb doesn't jump to the breakpoint and the frame is 'cursed'
> M-x
> ;; The frame wakes up and gdb reaches the breakpoint.

And if you apply your patch, do we get MapNotify immediately after
"selecting again the hidden frame"?

Btw, what does "selecting again the hidden frame" mean, exactly?  What
gestures do you use to do that?  And what is your window manager?
(Bhavin, can you answer these questions for your case as well?)