预缓存实用程序改动

compositions.py

@@ -188,6 +188,7 @@ class FillBlank(Composition):
         yield Button("退格", id=self.regid(f"delete"))
 
     def handler(self, event, type_):
+        # TODO: 改动：在线错误纠正
         if type_ == "button":
             if self.recid(event.button.id) == "delete":
                 if len(self.inputlist) > 0:
@@ -293,4 +294,4 @@ class AppLauncher(App):
 
 if __name__ == "__main__":
     app = AppLauncher()
-    app.run()
+    app.run()