gdk: Make window moves a custom vfunc

The window move code needs special attention for multiple reasons:
- invalid areas for expose events need to be modified
- self-copy is not supported by Cairo
- in X11, copying from an overlapped Window might cause unexposed areas
  to be copied in, spo expose events for those need to be generated.

This was all special cased in various parts of the code. By making it an
explicit vfunc, we can work around it.

gdk/quartz/gdkgeometry-quartz.c

@@ -22,34 +22,32 @@
 
 #include "gdkprivate-quartz.h"
 
+/* FIXME: Tis function has never been compiled.
+ * Please make it work. */
 void
-_gdk_quartz_window_queue_translation (GdkWindow *window,
-				      GdkGC     *gc,
-                                      cairo_region_t *area,
-                                      gint       dx,
-                                      gint       dy)
+_gdk_quartz_window_translate (GdkWindow      *window,
+                              cairo_region_t *area,
+                              gint            dx,
+                              gint            dy)
 {
   GdkWindowObject *private = (GdkWindowObject *)window;
   GdkWindowImplQuartz *impl = (GdkWindowImplQuartz *)private->impl;
+  GdkRectangle extents;
 
-  int i, n_rects;
-  cairo_region_t *intersection;
-  GdkRectangle rect;
+  cairo_region_get_extents (area, &extents);
 
-  /* We will intersect the known region that needs display with the given
-   * area.  This intersection will be translated by dx, dy.  For the end
-   * result, we will also set that it needs display.
-   */
+  [window_impl->view scrollRect:NSMakeRect (extents.x, extents.y, extents.width, extents.height)
+                             by:NSMakeSize (dx, dy)];
 
-  if (!impl->needs_display_region)
-    return;
+  if (impl->needs_display_region)
+    {
+      intersection = cairo_region_copy (impl->needs_display_region);
+      cairo_region_intersect_rectangle (intersection, extents);
+      cairo_region_translate (intersection, dx, dy);
 
-  intersection = cairo_region_copy (impl->needs_display_region);
-  cairo_region_intersect (intersection, area);
-  cairo_region_translate (intersection, dx, dy);
-
-  _gdk_quartz_window_set_needs_display_in_region (window, intersection);
-  cairo_region_destroy (intersection);
+      _gdk_quartz_window_set_needs_display_in_region (window, intersection);
+      cairo_region_destroy (intersection);
+    }
 }
 
 gboolean

gdk/quartz/gdkwindow-quartz.c

@@ -3102,6 +3102,6 @@ gdk_window_impl_iface_init (GdkWindowImplIface *iface)
   iface->input_shape_combine_region = gdk_window_quartz_input_shape_combine_region;
   iface->set_static_gravities = gdk_window_quartz_set_static_gravities;
   iface->queue_antiexpose = _gdk_quartz_window_queue_antiexpose;
-  iface->queue_translation = _gdk_quartz_window_queue_translation;
+  iface->translate = _gdk_quartz_window_translate;
   iface->destroy = _gdk_quartz_window_destroy;
 }