bug#25542: 25.1; Restoring the frame from fullscreen to maximized

[Eli Zaretskii <eliz@gnu.org>]

> Cc: Lars Magne Ingebrigtsen <larsi@gnus.org>, 25542@debbugs.gnu.org,
>  Noam Postavsky <npostavs@users.sourceforge.net>,
>  martin rudalics <rudalics@gmx.at>
> From: Ken Brown <kbrown@cornell.edu>
> Date: Sat, 5 Sep 2020 11:10:31 -0400
> 
> diff --git a/src/w32term.c b/src/w32term.c
> index 76cf6bd696..c7da95528b 100644
> --- a/src/w32term.c
> +++ b/src/w32term.c
> @@ -5454,15 +5454,7 @@ w32_read_socket (struct terminal *terminal,
>                       simple hack to check that based on the fact that
>                       only a maximized fullscreen frame should have both
>                       top/left outside the screen.  */
> -                 if (EQ (fullscreen, Qfullwidth) || EQ (fullscreen, Qfullheight)
> -                     || NILP (fullscreen))
> -                     {
> -                       int x, y;
> -
> -                       w32_real_positions (f, &x, &y);
> -                       if (x < 0 && y < 0)
> -                         store_frame_param (f, Qfullscreen, Qmaximized);
> -                     }
> +                   store_frame_param (f, Qfullscreen, Qmaximized);
>                    }
> 
>                    break;
> 
> If I make this change and follow Dani's recipe from the original bug report, the 
> second F11 press doesn't restore the previous state.  Instead, the frame appears 
> to get slightly smaller for an instant and then immediately reverts to 
> fullscreen mode.

Thanks for testing.  It sounds like the proposed change leaves the
original incorrect behavior unchanged, so we need to look for some
different way of fixing this.