Clear stale sign data when signs break

mosfet/world.py

@@ -25,6 +25,11 @@ class World:
     def block_at(self, x, y, z):
         return self.g.chunks.get_block_at(x, y, z)
 
+    @staticmethod
+    def _is_sign_state(state_id):
+        name = blocks.BLOCKS.get(state_id)
+        return name is not None and name.endswith('_sign')
+
     @staticmethod
     def _sign_component_text(value):
         if value is None:
@@ -58,6 +63,12 @@ class World:
         for position, entity in self.g.chunks.block_entities.items():
             if utils.phyp(center, position) > distance:
                 continue
+            get_block_at = getattr(self.g.chunks, 'get_block_at', None)
+            if callable(get_block_at):
+                state_id = get_block_at(*position)
+                if (state_id is not None and
+                        not self._is_sign_state(state_id)):
+                    continue
             data = entity.get('data') or {}
             for side in ('front', 'back'):
                 text_data = data.get(side + '_text')