From 21ecc7a1d08b2ebc6c4fa1553c7e01986d3251ca Mon Sep 17 00:00:00 2001
From: Will McGugan <willmcgugan@gmail.com>
Date: Sat, 6 Aug 2022 09:06:25 +0100
Subject: [PATCH] restore missing callback

---
 src/textual/message_pump.py | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/textual/message_pump.py b/src/textual/message_pump.py
index 61f3465f8..f795cf88f 100644
--- a/src/textual/message_pump.py
+++ b/src/textual/message_pump.py
@@ -398,6 +398,9 @@ class MessagePump:
             return False
         return self.post_message_no_wait(message)
 
+    async def on_callback(self, event: events.Callback) -> None:
+        await invoke(event.callback)
+
     def emit_no_wait(self, message: Message) -> bool:
         if self._parent:
             return self._parent.post_message_from_child_no_wait(message)