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

[martin rudalics]

> Your assumption is correct. I added some message calls to master (as
> in the attached diff). With the taskbar on the left I got:
>
> SIZE_MAXIMIZED, fullscreen = nil
> SIZE_MAXIMIZED, x = 54, y = -8
>
> on the maximize, and
>
> SIZE_MAXIMIZED, fullscreen = fullboth
>
> on hitting f11 the first time. Nothing the second time (when Emacs
> incorrectly switches to non-maximized state).
>
> With the taskbar on top it's the same except x = -8, y = 22 (when
> taskbar is on the right or botton both x and y are -8 and the the
> second f11 produces the same message as maximizing).

Thank you very much for checking.  I suppose that replacing

                  if (EQ (fullscreen, Qfullwidth) || EQ (fullscreen, 
Qfullheight)
                      || NILP (fullscreen))
                      {
                        int x, y;

                        x_real_positions (f, &x, &y);
                        if (x < 0 && y < 0)
                          store_frame_param (f, Qfullscreen, Qmaximized);
                      }

with

                          store_frame_param (f, Qfullscreen, Qmaximized);

should work because I doubt that "Windows can send us a SIZE_MAXIMIZED
message even when fullscreen is fullboth" can happen but who knows ...

martin