[gtk] gl renderer: Don't highlight cairo nodes as fallback

[Timm Bäder <baedert src gnome org>]

commit 08296b8aeed09a45bf73d2889067ef78f4cba1e1
Author: Timm Bäder <mail baedert org>
Date:   Fri Mar 30 23:32:19 2018 +0200

    gl renderer: Don't highlight cairo nodes as fallback

 gsk/gl/gskglrenderer.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)
---
diff --git a/gsk/gl/gskglrenderer.c b/gsk/gl/gskglrenderer.c
index d903a20ba0..697047e590 100644
--- a/gsk/gl/gskglrenderer.c
+++ b/gsk/gl/gskglrenderer.c
@@ -288,10 +288,13 @@ render_fallback_node (GskGLRenderer       *self,
   cairo_restore (cr);
 
 #if HIGHLIGHT_FALLBACK
-  cairo_move_to (cr, 0, 0);
-  cairo_rectangle (cr, 0, 0, node->bounds.size.width, node->bounds.size.height);
-  cairo_set_source_rgba (cr, 1, 0, 0, 1);
-  cairo_stroke (cr);
+  if (gsk_render_node_get_node_type (node) != GSK_CAIRO_NODE)
+    {
+      cairo_move_to (cr, 0, 0);
+      cairo_rectangle (cr, 0, 0, node->bounds.size.width, node->bounds.size.height);
+      cairo_set_source_rgba (cr, 1, 0, 0, 1);
+      cairo_stroke (cr);
+    }
 #endif
   cairo_destroy (cr);