remove dead ends

lib/tiles.py

@@ -139,8 +139,19 @@ class Tile:
                     if shape.contains(line_string):
                         graph.add_edge(line[0], line[1])
 
+        self._remove_dead_ends(graph)
+
         return graph
 
+    def _remove_dead_ends(self, graph):
+        while True:
+            nodes_with_degree_1 = [node for node, degree in graph.degree() if degree == 1]
+
+            if nodes_with_degree_1:
+                graph.remove_nodes_from(nodes_with_degree_1)
+            else:
+                return
+
 
 def all_tile_paths():
     return [os.path.join(guess_inkscape_config_path(), 'tiles'),