refactoring

src/roster_window.py

@@ -1503,9 +1503,7 @@ class RosterWindow:
             # do not change selection while DND'ing
             return
         # Expand his parent, so this path is visible, don't expand it.
-        path_ = str(path.get_indices()[:-1])[1:-1]
-        path_ = path_.replace(', ', ':')
-        path = path.new_from_string(path_)
+        path.up()
         self.tree.expand_to_path(path)
         self.tree.scroll_to_cell(path)
         self.tree.set_cursor(path)