[gimp] Don't allow to drop stuff to locked drawables

[Michael Natterer <mitch src gnome org>]

commit b929a7a67c5e9b39dcc154c6301b7c79e931ddd0
Author: Michael Natterer <mitch gimp org>
Date:   Fri Aug 21 14:10:22 2009 +0200

    Don't allow to drop stuff to locked drawables

 app/widgets/gimpdrawabletreeview.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)
---
diff --git a/app/widgets/gimpdrawabletreeview.c b/app/widgets/gimpdrawabletreeview.c
index 35013cf..c0bea06 100644
--- a/app/widgets/gimpdrawabletreeview.c
+++ b/app/widgets/gimpdrawabletreeview.c
@@ -215,7 +215,8 @@ gimp_drawable_tree_view_drop_possible (GimpContainerTreeView   *tree_view,
       if (src_type == GIMP_DND_TYPE_COLOR ||
           src_type == GIMP_DND_TYPE_PATTERN)
         {
-          if (! dest_viewable)
+          if (! dest_viewable ||
+              gimp_item_get_lock_content (GIMP_ITEM (dest_viewable)))
             return FALSE;
 
           if (return_drop_pos)