[gimp] app: in GimpDrawableFilter, set underlying operation

[Ell <ell src gnome org>]

commit b0dfc1e7c721263a8b293513ebb22aa3b7dd0348
Author: Ell <ell_se yahoo com>
Date:   Wed Mar 27 15:06:32 2019 -0400

    app: in GimpDrawableFilter, set underlying operation
    
    In GimpDrawableFilter, use
    gimp_gegl_node_set_underlying_operation() to the the input
    operation node as the underlying operation of the filter node.

 app/core/gimpdrawablefilter.c | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/app/core/gimpdrawablefilter.c b/app/core/gimpdrawablefilter.c
index ecc157ccc8..21b522b1c9 100644
--- a/app/core/gimpdrawablefilter.c
+++ b/app/core/gimpdrawablefilter.c
@@ -214,6 +214,7 @@ gimp_drawable_filter_new (GimpDrawable *drawable,
   node = gimp_filter_get_node (GIMP_FILTER (filter));
 
   gegl_node_add_child (node, operation);
+  gimp_gegl_node_set_underlying_operation (node, operation);
 
   filter->applicator = gimp_applicator_new (node);