Revert "ngl: Remove duplicate check"

This reverts commit 1fd534ef1ee0f5e62dbdcf1f82ed7dc287d77d13.

This change revealed that we are not treating damage regions
correctly, and we regularly end up with

diff --git a/gsk/ngl/gsknglrenderer.c b/gsk/ngl/gsknglrenderer.c
index 4c6a077ab3518bcbbb03d9b5f48ba9f76735e25e..66edc98d5d98533902507a55c900474ab9cd7964 100644 (file)
--- a/gsk/ngl/gsknglrenderer.c
+++ b/gsk/ngl/gsknglrenderer.c
@@ -173,7 +173,10 @@ get_render_region (GdkSurface   *surface,
    */
   damage = gdk_draw_context_get_frame_region (GDK_DRAW_CONTEXT (context));
 
-  /* If the extents match the full-scene, return NULL */
+  if (cairo_region_contains_rectangle (damage, &whole_surface) == CAIRO_REGION_OVERLAP_IN)
+    return NULL;
+
+  /* If the extents match the full-scene, do the same as above */
   cairo_region_get_extents (damage, &extents);
   if (gdk_rectangle_equal (&extents, &whole_surface))
     return NULL;