[gnome-mahjongg/arnaudb/wip/gtk4: 13/24] Adapt to size_allocate.

[Arnaud B. <arnaudb src gnome org>]

commit 92dac1d91b20d37e744ab7d622343843b9eb09e4
Author: Arnaud Bonatti <arnaud bonatti gmail com>
Date:   Fri Mar 27 19:45:05 2020 +0100

    Adapt to size_allocate.

 src/gnome-mahjongg.vala | 17 +++++++++--------
 1 file changed, 9 insertions(+), 8 deletions(-)
---
diff --git a/src/gnome-mahjongg.vala b/src/gnome-mahjongg.vala
index 7c1d766..e5d37e9 100644
--- a/src/gnome-mahjongg.vala
+++ b/src/gnome-mahjongg.vala
@@ -80,7 +80,6 @@ public class Mahjongg : Gtk.Application
         history.load ();
 
         window = new Gtk.ApplicationWindow (this);
-        window.size_allocate.connect (size_allocate_cb);
         window.map.connect (init_state_watcher);
         window.set_default_size (settings.get_int ("window-width"), settings.get_int ("window-height"));
         if (settings.get_boolean ("window-is-maximized"))
@@ -186,13 +185,6 @@ public class Mahjongg : Gtk.Application
         tick_cb ();
     }
 
-    private void size_allocate_cb (Gtk.Allocation allocation)
-    {
-        if (is_maximized || is_tiled)
-            return;
-        window.get_size (out window_width, out window_height);
-    }
-
     private void init_state_watcher ()
     {
         Gdk.Surface? nullable_surface = window.get_surface ();      // TODO report bug, get_surface() 
returns a nullable Surface
@@ -200,6 +192,15 @@ public class Mahjongg : Gtk.Application
             assert_not_reached ();
         surface = (Gdk.Toplevel) (!) nullable_surface;
         surface.notify ["state"].connect (on_window_state_event);
+        surface.size_changed.connect (on_size_changed);
+    }
+
+    private inline void on_size_changed (Gdk.Surface _surface, int width, int height)
+    {
+        if (is_maximized || is_tiled)
+            return;
+        window_width  = width;
+        window_height = height;
     }
 
     private Gdk.Toplevel surface;