[Fix] Update Node depth when adding new Edges to a Pathway (#384)

Co-authored-by: Tim Lorsbach <tim@lorsba.ch>
Reviewed-on: enviPath/enviPy#384

epdb/views.py

@@ -2506,6 +2506,9 @@ def package_pathway_edges(request, package_uuid, pathway_uuid):
             substrate_nodes, product_nodes, name=edge_name, description=edge_description
         )
 
+        # Update depths as sideeffect of above operation
+        current_pathway.update_depths()
+
         return redirect(current_pathway.url)
 
     else: