Fix 2412072: don't remove a node from the parent set of a linkable valuenode when...

git-svn-id: https://synfig.svn.sourceforge.net/svnroot/synfig@2311 1f10aa63-cdf2-0310-b900-c93c546f37ac

diff --git a/synfig-core/trunk/src/synfig/valuenode.cpp b/synfig-core/trunk/src/synfig/valuenode.cpp
index 5d8647a..7059cf9 100644 (file)
--- a/synfig-core/trunk/src/synfig/valuenode.cpp
+++ b/synfig-core/trunk/src/synfig/valuenode.cpp
@@ -269,8 +269,23 @@ LinkableValueNode::set_link(int i,ValueNode::Handle x)
 
        if(set_link_vfunc(i,x))
        {
+               // Fix 2412072: remove the previous link from the parent_set unless one of the other links is also
+               // using it when we convert a value to 'switch', both 'on' and 'off' are linked to the same valuenode
+               // if we then disconnect one of the two, the one we disconnect is set to be a new valuenode_const
+               // and the previously shared value is removed from the parent set even though the other is still
+               // using it
                if(previous)
-                       remove_child(previous.get());
+               {
+                       int size = link_count(), index;
+                       for (index=0; index < size; ++index)
+                       {
+                               if (i == index) continue;
+                               if (get_link(index) == previous)
+                                       break;
+                       }
+                       if (index == size)
+                               remove_child(previous.get());
+               }
                add_child(x.get());
 
                if(!x->is_exported() && get_parent_canvas())