[gimp/gimp-2-8] Bug 724731 - Difference clouds - memory leak if UNDO performed

[Thomas Manni <tmanni src gnome org>]

commit 21a50c43cd66f1f9cedc18adc364b010dd9a9cba
Author: Thomas Manni <thomas manni free fr>
Date:   Tue Mar 1 22:40:01 2016 +0100

    Bug 724731 - Difference clouds - memory leak if UNDO performed
    
    Create the clouds layer after calling gimp-image-undo-group-start
    
    (cherry picked from commit a8a214ffcbb23649dad691bc84cdeb2c2baaf54a)

 plug-ins/script-fu/scripts/difference-clouds.scm |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)
---
diff --git a/plug-ins/script-fu/scripts/difference-clouds.scm 
b/plug-ins/script-fu/scripts/difference-clouds.scm
index 45ac44d..beb10b5 100644
--- a/plug-ins/script-fu/scripts/difference-clouds.scm
+++ b/plug-ins/script-fu/scripts/difference-clouds.scm
@@ -29,14 +29,17 @@
          (width         (cadddr (gimp-drawable-mask-intersect drawable)))
          (height        (caddr (cddr (gimp-drawable-mask-intersect drawable))))
          (type          (car (gimp-drawable-type-with-alpha drawable)))
-         (diff-clouds   (car (gimp-layer-new image width height type
-                                             "Clouds" 100 DIFFERENCE-MODE)))
+         (diff-clouds  -1)
          (offset-x      0)
          (offset-y      0)
         )
 
     (gimp-image-undo-group-start image)
 
+    ; Create the cloud layer
+    (set! diff-clouds (car (gimp-layer-new image width height type
+                                             "Clouds" 100 DIFFERENCE-MODE)))
+
     ; Add the cloud layer above the current layer
     (gimp-image-insert-layer image diff-clouds 0 -1)