(sprites) Implement fingerprint for empty sprites

ahyangyi · ahyangyi · commit d1e4fda50ec4 · 2025-12-20T02:53:34.000+08:00
diff --git a/agrf/sprites/empty.py b/agrf/sprites/empty.py
@@ -43,7 +43,8 @@ def get_resource_files(self):
 
 
 class EmptyAlternativeSprites(grf.AlternativeSprites):
-    pass
+    def get_fingerprint(self):
+        return {"sprites": [s.get_fingerprint() for s in self.sprites]}
 
 
 def empty_alternatives(w, h, xofs, yofs):
