[five-or-more/arnaudb/gtk3: 22/24] Revert "Make on_window_state_event work."

[Arnaud B. <arnaudb src gnome org>]

commit cf2760b1b78213776a31c5063aa9f588f0516c2e
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Thu Oct 22 17:30:35 2020 +0200

    Revert "Make on_window_state_event work."
    
    This reverts commit a02dea100e422d4ad42731e49a001cd91c92e73e.

 src/window.vala | 26 ++++++--------------------
 1 file changed, 6 insertions(+), 20 deletions(-)
---
diff --git a/src/window.vala b/src/window.vala
index 276d1e1..9f6e048 100644
--- a/src/window.vala
+++ b/src/window.vala
@@ -74,8 +74,6 @@ private class GameWindow : ApplicationWindow
     {
         add_action_entries (win_actions, this);
 
-        map.connect (init_state_watcher);
-
         SimpleAction theme_action = (SimpleAction) lookup_action ("change-theme");
         string theme_value = settings.get_string (FiveOrMoreApp.KEY_THEME);
         if (theme_value != "balls.svg" && theme_value != "shapes.svg" && theme_value != "tango.svg") /* TODO 
use an enum in GSchema file? */
@@ -127,27 +125,15 @@ private class GameWindow : ApplicationWindow
         init_scores_dialog ();
     }
 
-    private void init_state_watcher ()
+    protected override bool window_state_event (Gdk.EventWindowState event)
     {
-        Gdk.Surface? nullable_surface = get_surface ();     // TODO report bug, get_surface() returns a 
nullable Surface
-        if (nullable_surface == null || !((!) nullable_surface is Gdk.Toplevel))
-            assert_not_reached ();
-        surface = (Gdk.Toplevel) (!) nullable_surface;
-        surface.notify ["state"].connect (on_window_state_event);
-    }
+        if ((event.changed_mask & Gdk.WindowState.MAXIMIZED) != 0)
+            window_maximized = (event.new_window_state & Gdk.WindowState.MAXIMIZED) != 0;
 
-    private Gdk.Toplevel surface;
-    private const Gdk.ToplevelState tiled_state = Gdk.ToplevelState.TILED
-                                                | Gdk.ToplevelState.TOP_TILED
-                                                | Gdk.ToplevelState.BOTTOM_TILED
-                                                | Gdk.ToplevelState.LEFT_TILED
-                                                | Gdk.ToplevelState.RIGHT_TILED;
-    private inline void on_window_state_event ()
-    {
-        Gdk.ToplevelState state = surface.get_state ();
+        if ((event.changed_mask & Gdk.WindowState.TILED) != 0)
+            window_tiled = (event.new_window_state & Gdk.WindowState.TILED) != 0;
 
-        window_maximized =  (state & Gdk.ToplevelState.MAXIMIZED) != 0;
-        window_tiled =      (state & tiled_state)                 != 0;
+        return false;
     }
 
     protected override void size_allocate (Allocation allocation)