From 825f21fe2865b5d7c1b0e38b433c3b19e71541ee Mon Sep 17 00:00:00 2001
From: Will McGugan <willmcgugan@gmail.com>
Date: Fri, 24 Feb 2023 12:09:50 +0000
Subject: [PATCH] comments

---
 src/textual/message_pump.py | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/textual/message_pump.py b/src/textual/message_pump.py
index 9122175d6..7a2f6d24e 100644
--- a/src/textual/message_pump.py
+++ b/src/textual/message_pump.py
@@ -606,6 +606,8 @@ class MessagePump(metaclass=MessagePumpMeta):
             return False
         if not self.check_message_enabled(message):
             return True
+        # Add a copy of the prevented message types to the message
+        # This is so that prevented messages are honoured by the event's handler
         message._prevent.update(self._get_prevented_messages())
         await self._message_queue.put(message)
         return True
@@ -645,6 +647,8 @@ class MessagePump(metaclass=MessagePumpMeta):
             return False
         if not self.check_message_enabled(message):
             return False
+        # Add a copy of the prevented message types to the message
+        # This is so that prevented messages are honoured by the event's handler
         message._prevent.update(self._get_prevented_messages())
         self._message_queue.put_nowait(message)
         return True