[gimp/gimp-2-10] app: in gimp-gegl-nodes, set underlying operation

[Ell <ell src gnome org>]

commit 3e2738e944ce2a122dd328a59559288c6fe265e6
Author: Ell <ell_se yahoo com>
Date:   Tue Apr 30 14:27:19 2019 -0400

    app: in gimp-gegl-nodes, set underlying operation
    
    In the vairous gimp_gegl_create_foo_node() functions, set the
    parent node's underlying operation node, so that
    gimp_gegl_apply_cached_operation() avoids duplicating the source
    buffer when applying these nodes (all underlying operations are
    currently point ops.)
    
    (cherry picked from commit 928e5957e3e3b4fb6cd4c98991978b328986c46f)

 app/gegl/gimp-gegl-nodes.c | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/app/gegl/gimp-gegl-nodes.c b/app/gegl/gimp-gegl-nodes.c
index b12f3a1ca5..66fbc9f169 100644
--- a/app/gegl/gimp-gegl-nodes.c
+++ b/app/gegl/gimp-gegl-nodes.c
@@ -63,6 +63,8 @@ gimp_gegl_create_flatten_node (const GimpRGB       *background,
                                NULL);
   g_object_unref (c);
 
+  gimp_gegl_node_set_underlying_operation (node, color);
+
   mode = gegl_node_new_child (node,
                               "operation", "gimp:normal",
                               NULL);
@@ -106,6 +108,8 @@ gimp_gegl_create_apply_opacity_node (GeglBuffer *mask,
                                       "value",     opacity,
                                       NULL);
 
+  gimp_gegl_node_set_underlying_operation (node, opacity_node);
+
   mask_source = gimp_gegl_add_buffer_source (node, mask,
                                              mask_offset_x,
                                              mask_offset_y);