Walking tree up and GetNodeData #831

Normaly if I want to walk up in tree I do:

while n <> nil do
 n := n.Parent;

But this like can walk over the tree... It's stupid... An now:

while n <> nil do
begin
 vst.GetNodeData(n);
 n := n.Parent;
end;

If I do this for RootNode, ale is ok (GetNodeData return nil and function don't change anything). But what happen next? RootNode still have Parent and GetNodeData for this (it's not a node!) change some propertys like for Node element.

Ok, I can check no n <> nil but n <> vst.RootNode. But component herself don't check this!