[Gtk-sharp-list] Can we make NodeStore.GetPath public?

[Eric Butler]

I'd like to check if a node in the NodeStore is expanded,
TreeView.GetRowExpanded takes a TreePath, but it doesnt look like
theres any way to get a TreeNode's path because there is no way to get
it's top-level index (Nodes.IndexOf). NodeStore already has a GetPath
method but its marked internal, can we change this to be public?

- Eric