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

[Tino Calancha]

On Fri, 30 Sep 2022, Po Lu wrote:

> > 1. The breakpoint at gdk_wayland_window_handle_configure is never reached.
> >     I have tried with both patches discussed above, and the master branch
> >     with no success: such breakpoint is not reached.

It turned out I was missing some debugging symbols.
Once iinstalled all the debugging symbols the breakpoint is reached as 
expected.


> > > Could you install debug info for GDK, put breakpoints on both
> > > window_state_event (in pgtkterm.c) and
> > > gdk_wayland_window_handle_configure (in gdkwindow-wayland.c)?
> >
> > > Please see whether the former is called after the latter, and in doing
> > > so clears the iconified flag?

The iconified flag is cleared, but I cannot tell you where this happens.
Of course, that prevents us to enter in the `if` branch at line 5472:
if (FRAME_ICONIFIED_P (f))


My two fixes point to the `else` branch at line 5505:

```
  if (new_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);
    }
```

1. The first one "extends" this branch by adding this line:

SET_FRAME_VISIBLE (f, 1);

2. The second one just removes that `else` branch.

Both seems to fix the issue in my Wayland session.