gdkwindow: Fix update area calculations for native subwindows

When recursing the update area down into native subwindows we forgot
to apply the native window position. This caused us to repaint the
wrong thing in certain cases. I noticed this when playing with the
wip/gdk-gl branch, because it was triggering unnecessary repaints
of the (native window) gl widgets.

diff --git a/gdk/gdkwindow.c b/gdk/gdkwindow.c
index b9b2e28b704d49f04fe100faf4b58eb7c0a2b254..0460ffca81f90230bb4161c686f192f33d64bbc6 100644 (file)
--- a/gdk/gdkwindow.c
+++ b/gdk/gdkwindow.c
@@ -3762,23 +3762,18 @@ invalidate_impl_subwindows (GdkWindow            *window,
          if (gdk_window_has_impl (child))
            {
              cairo_region_t *tmp = cairo_region_copy (region);
-             cairo_region_translate (tmp, -dx, -dy);
+             cairo_region_translate (tmp, -dx - child->x, -dy - child->y);
              gdk_window_invalidate_maybe_recurse_full (child,
                                                        tmp, child_func, user_data);
              cairo_region_destroy (tmp);
            }
          else
            {
-             dx += child->x;
-             dy += child->y;
              invalidate_impl_subwindows (child,
                                          region,
                                          child_func, user_data,
-                                         dx, dy);
-             dx -= child->x;
-             dy -= child->y;
+                                         dx + child->x, dy + child->y);
            }
-
        }
     }
 }