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

[Eli Zaretskii]

> From: Tino Calancha <tino.calancha@gmail.com>
> Cc: Bhavin Gandhi <bhavin7392@gmail.com>,  42655@debbugs.gnu.org,
>   eggert@cs.ucla.edu,  uyennhi.qm@gmail.com,  monnier@iro.umontreal.ca
> Date: Thu, 06 Aug 2020 10:13:06 +0200
> 
> >   (gdb) p *$2->output_data.x
> >
> > This assumes that $2 is as you have show  previously, i.e. a pointer to 
> > struct frame that corresponds to the selected frame.
> 
> (gdb) xframe (selected_frame)
> $3 = (struct frame *) 0x234f888
> "emacs@localhost.example.com"
> (gdb) p *$3->output_data.x
> $4 = {

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?