[gimp] app: in the gradient tool, set the graph's underlying node

[Ell <ell src gnome org>]

commit a1f676aabd0451f81384504655917afa0ffcd143
Author: Ell <ell_se yahoo com>
Date:   Sun Jul 28 11:53:03 2019 +0300

    app: in the gradient tool, set the graph's underlying node
    
    ... to the gimp:gradient node

 app/tools/gimpgradienttool.c | 5 +++++
 1 file changed, 5 insertions(+)
---
diff --git a/app/tools/gimpgradienttool.c b/app/tools/gimpgradienttool.c
index 33488a85c2..598f804fc2 100644
--- a/app/tools/gimpgradienttool.c
+++ b/app/tools/gimpgradienttool.c
@@ -30,6 +30,8 @@
 
 #include "config/gimpguiconfig.h"
 
+#include "gegl/gimp-gegl-utils.h"
+
 #include "operations/gimp-operation-config.h"
 
 #include "operations/layer-modes/gimp-layer-modes.h"
@@ -887,6 +889,9 @@ gimp_gradient_tool_create_graph (GimpGradientTool *gradient_tool)
                        output,
                        NULL);
 
+  gimp_gegl_node_set_underlying_operation (gradient_tool->graph,
+                                           gradient_tool->render_node);
+
   gimp_gradient_tool_update_graph (gradient_tool);
 }