Send a motion-notify when a (new) main window became active

This motion-notify even will make sure that things like highlights are
set up correctly now that the window has become active.

gdk/quartz/gdkwindow-quartz.c

@@ -747,13 +747,76 @@ _gdk_quartz_window_find_child (GdkWindow *window,
   return NULL;
 }
 
+
+static void
+generate_motion_event (GdkWindow *window)
+{
+  NSPoint point;
+  NSPoint screen_point;
+  NSWindow *nswindow;
+  GdkQuartzView *view;
+  GdkWindowObject *private;
+  GdkEvent *event;
+  gint x, y, x_root, y_root;
+  gdouble xx, yy;
+  GList *node;
+  GdkWindow *pointer_window;
+
+  event = gdk_event_new (GDK_MOTION_NOTIFY);
+  event->any.window = NULL;
+  event->any.send_event = TRUE;
+
+  private = (GdkWindowObject *)window;
+  nswindow = ((GdkWindowImplQuartz *)private->impl)->toplevel;
+  view = (GdkQuartzView *)[nswindow contentView];
+
+  screen_point = [NSEvent mouseLocation];
+
+  x_root = screen_point.x;
+  y_root = _gdk_quartz_window_get_inverted_screen_y (screen_point.y);
+
+  point = [nswindow convertScreenToBase:screen_point];
+
+  x = point.x;
+  y = private->height - point.y;
+
+  pointer_window = _gdk_window_find_descendant_at (window, x, y,
+                                                   &xx, &yy);
+
+  event->any.type = GDK_MOTION_NOTIFY;
+  event->motion.window = window;
+  event->motion.time = GDK_CURRENT_TIME;
+  event->motion.x = x;
+  event->motion.y = y;
+  event->motion.x_root = x_root;
+  event->motion.y_root = y_root;
+  /* FIXME event->axes */
+  event->motion.state = 0;
+  event->motion.is_hint = FALSE;
+  event->motion.device = _gdk_display->core_pointer;
+
+  if (event->any.window)
+    g_object_ref (event->any.window);
+
+  node = _gdk_event_queue_append (gdk_display_get_default (), event);
+  _gdk_windowing_got_event (gdk_display_get_default (), node, event, 0);
+}
+
 void
 _gdk_quartz_window_did_become_main (GdkWindow *window)
 {
   main_window_stack = g_slist_remove (main_window_stack, window);
 
   if (GDK_WINDOW_OBJECT (window)->window_type != GDK_WINDOW_TEMP)
-    main_window_stack = g_slist_prepend (main_window_stack, window);
+    {
+      main_window_stack = g_slist_prepend (main_window_stack, window);
+
+      /* We just became the active window, send a motion-notify
+       * event so things like highlights get set up correctly.
+       * This motion-notify is sent to the key window.
+       */
+      generate_motion_event (window);
+    }
 
   clear_toplevel_order ();
 }