remove prevent from callback

src/textual/events.py

@@ -32,10 +32,8 @@ class Callback(Event, bubble=False, verbose=True):
         self,
         sender: MessageTarget,
         callback: Callable[[], Awaitable[None]],
-        prevent: set[type[Message]] | None = None,
     ) -> None:
         self.callback = callback
-        self.prevent = frozenset(prevent) if prevent else None
         super().__init__(sender)
 
     def __rich_repr__(self) -> rich.repr.Result:

src/textual/message_pump.py

@@ -631,11 +631,7 @@ class MessagePump(metaclass=MessagePumpMeta):
         return self.post_message_no_wait(message)
 
     async def on_callback(self, event: events.Callback) -> None:
-        if event.prevent:
-            with self.prevent(*event.prevent):
-                await invoke(event.callback)
-        else:
-            await invoke(event.callback)
+        await invoke(event.callback)
 
     # TODO: Does dispatch_key belong on message pump?
     async def dispatch_key(self, event: events.Key) -> bool:

src/textual/reactive.py

@@ -235,9 +235,7 @@ class Reactive(Generic[ReactiveType]):
                 # Result is awaitable, so we need to await it within an async context
                 obj.post_message_no_wait(
                     events.Callback(
-                        sender=obj,
-                        callback=partial(await_watcher, watch_result),
-                        prevent=obj._prevent_message_types_stack[-1],
+                        sender=obj, callback=partial(await_watcher, watch_result)
                     )
                 )