bug#58164: 28.1; keybinding C-z to suspend-frame in fvwm windowmanager seems to get lost after first use.

[Eli Zaretskii]

> Date: Fri, 30 Sep 2022 08:45:33 +0200
> Cc: 58164@debbugs.gnu.org
> From: Jos de Kloe <kloe0040@planet.nl>
> 
> This is the output I get:
> 
>   <down> ;; next-line
>   C-z ;; suspend-frame
>   C-z ;; suspend-frame
>   C-h l       ;; view-lossage

So I guess the problem is in the X iconify_frame_hook, which is
x_iconify_frame.  If you can step through that function in a debugger
and see what's going on there, it might help.  Maybe Emacs thinks the
frame is already iconified, and thus does nothing?

Thanks.