Fix for the bad node count in a callback

Fix for bug LP #1078368. Node has to be removed from the internal
structure before calling callbacks.

However, parents of the node have to be notified and therefore the node
information is stored locally to access that information.

liblarch/filteredtree.py

@@ -235,16 +235,15 @@ def __update_node(self, node_id, direction):
                 self.nodes[child_id]['parents'].remove(node_id)
                 self.__update_node(child_id,direction="down")
 
+            node = self.nodes.pop(node_id)
             for path in paths:
                 self.callback(action, node_id, path)
 
             # Remove node from cache
-            for parent_id in self.nodes[node_id]['parents']:
+            for parent_id in node['parents']:
                 self.nodes[parent_id]['children'].remove(node_id)
                 self.__update_node(parent_id,direction="up")
 
-            self.nodes.pop(node_id)
-
             # We update parents who are not displayed
             # If the node is only hidden and still exists in the tree
             if self.tree.has_node(node_id):