Let the MetaWindow calculate its main logical monitor itself

There is no point in going via a MetaScreen API to calculate the "main
monitor" of a window, so let the window do that calculation itself.

https://bugzilla.gnome.org/show_bug.cgi?id=777732

src/core/screen-private.h

@@ -130,9 +130,6 @@ void          meta_screen_hide_tile_preview            (MetaScreen    *screen);
 MetaWindow*   meta_screen_get_mouse_window     (MetaScreen                 *screen,
                                                 MetaWindow                 *not_this_one);
 
-MetaLogicalMonitor * meta_screen_calculate_logical_monitor_for_window (MetaScreen *screen,
-                                                                       MetaWindow *window);
-
 MetaLogicalMonitor * meta_screen_get_monitor_neighbor (MetaScreen         *screen,
                                                        int                 which_monitor,
                                                        MetaScreenDirection dir);

src/core/screen.c

@@ -1401,21 +1401,6 @@ meta_screen_get_mouse_window (MetaScreen  *screen,
   return window;
 }
 
-MetaLogicalMonitor *
-meta_screen_calculate_logical_monitor_for_window (MetaScreen *screen,
-                                                  MetaWindow *window)
-{
-  MetaBackend *backend = meta_get_backend ();
-  MetaMonitorManager *monitor_manager =
-    meta_backend_get_monitor_manager (backend);
-  MetaRectangle window_rect;
-
-  meta_window_get_frame_rect (window, &window_rect);
-
-  return meta_monitor_manager_get_logical_monitor_from_rect (monitor_manager,
-                                                             &window_rect);
-}
-
 int
 meta_screen_get_monitor_index_for_rect (MetaScreen    *screen,
                                         MetaRectangle *rect)

src/core/window.c

@@ -829,6 +829,19 @@ meta_window_main_monitor_changed (MetaWindow               *window,
                            window->monitor->number, window);
 }
 
+MetaLogicalMonitor *
+meta_window_calculate_main_logical_monitor (MetaWindow *window)
+{
+  MetaBackend *backend = meta_get_backend ();
+  MetaMonitorManager *monitor_manager =
+    meta_backend_get_monitor_manager (backend);
+  MetaRectangle window_rect;
+
+  meta_window_get_frame_rect (window, &window_rect);
+  return meta_monitor_manager_get_logical_monitor_from_rect (monitor_manager,
+                                                             &window_rect);
+}
+
 MetaWindow *
 _meta_window_shared_new (MetaDisplay         *display,
                          MetaScreen          *screen,
@@ -1026,8 +1039,7 @@ _meta_window_shared_new (MetaDisplay         *display,
 
   window->compositor_private = NULL;
 
-  window->monitor =
+  window->monitor = meta_window_calculate_main_logical_monitor (window);
-    meta_screen_calculate_logical_monitor_for_window (window->screen, window);
   window->preferred_output_winsys_id = window->monitor->winsys_id;
 
   window->tile_match = NULL;

src/wayland/meta-window-wayland.c

@@ -361,7 +361,7 @@ meta_window_wayland_update_main_monitor (MetaWindow *window)
    * needed to avoid jumping back and forth between the new and the old, since
    * changing main monitor may cause the window to be resized so that it no
    * longer have that same new main monitor. */
-  to = meta_screen_calculate_logical_monitor_for_window (window->screen, window);
+  to = meta_window_calculate_main_logical_monitor (window);
 
   if (from == to)
     return;

src/x11/window-x11.c

@@ -1457,8 +1457,7 @@ meta_window_x11_update_icon (MetaWindow       *window,
 static void
 meta_window_x11_update_main_monitor (MetaWindow *window)
 {
-  window->monitor =
+  window->monitor = meta_window_calculate_main_logical_monitor (window);
-    meta_screen_calculate_logical_monitor_for_window (window->screen, window);
 }
 
 static void