don't bubble detached widgets

src/textual/message_pump.py

@@ -746,7 +746,7 @@ class MessagePump(metaclass=_MessagePumpMeta):
             if message._sender is not None and message._sender == self._parent:
                 # parent is sender, so we stop propagation after parent
                 message.stop()
-            if self.is_parent_active and not self._parent._closing:
+            if self.is_parent_active and not self._parent._closing and self.is_attached:
                 message._bubble_to(self._parent)
 
     def check_idle(self) -> None:

src/textual/widget.py

@@ -4,7 +4,7 @@ The base class for widgets.
 
 from __future__ import annotations
 
-from asyncio import Lock, create_task, wait
+from asyncio import create_task, wait
 from collections import Counter
 from contextlib import asynccontextmanager
 from fractions import Fraction
@@ -81,6 +81,7 @@ from .notifications import SeverityLevel
 from .reactive import Reactive
 from .render import measure
 from .renderables.blank import Blank
+from .rlock import RLock
 from .strip import Strip
 from .walk import walk_depth_first
 
@@ -396,7 +397,7 @@ class Widget(DOMNode):
         if self.BORDER_SUBTITLE:
             self.border_subtitle = self.BORDER_SUBTITLE
 
-        self.lock = Lock()
+        self.lock = RLock()
         """`asyncio` lock to be used to synchronize the state of the widget.
 
         Two different tasks might call methods on a widget at the same time, which
@@ -3550,7 +3551,6 @@ class Widget(DOMNode):
                 self.log.warning(self, f"IS NOT RUNNING, {message!r} not sent")
             except NoActiveAppError:
                 pass
-
         return super().post_message(message)
 
     async def _on_idle(self, event: events.Idle) -> None:

tests/test_widget_removing.py

@@ -78,7 +78,7 @@ async def test_remove_move_focus():
         assert pilot.app.focused == buttons[9]
 
 
-async def test_widget_remove_order():
+async def test_widget_remove_order() -> None:
     """A Widget.remove of a top-level widget should cause bottom-first removal."""
 
     removals: list[str] = []