Subject: bug#55836: 29.0.50; (iconify-frame) freezes buffer view under Wayland.

From: [email-masked]
Date: Mon, 20 Jun 2022 00:09:37 +0200

On 6/8/22 02:32, Po Lu wrote:

> Can you set a breakpoint here (in pgtkterm.c), and see if it is ever hit
> when you deiconify Emacs?
>
>    if (event->window_state.new_window_state
>        & GDK_WINDOW_STATE_ICONIFIED)
>      SET_FRAME_ICONIFIED (f, true);
>    else
>      {
> -->   FRAME_X_OUTPUT (f)->has_been_visible = true;
>        inev.ie.kind = DEICONIFY_EVENT;
>        XSETFRAME (inev.ie.frame_or_window, f);
>        SET_FRAME_ICONIFIED (f, false);
>      }
>
This breakpoint actually hits whenever the emacs frame gets focus, and 
makes debugging quite annoying.
However, by inputting M-x + <tab> during the breakpoint and using the 
mouse when the frame does not
have focus, it is possible to execute (iconify-frame) interactively 
after triggering the breakpoint.

Here's the strange thing: when a breakpoint is set there, the issue is 
not present; when the breakpoint
is deleted and the procedure repeated, the issue reappears.

I would conjecture that this has to do with the state of the frame at 
the moment of (de-)/iconification,
since when the breakpoint IS present, I would have to be looking at gdb, 
cycling through 'continue's.