Remove media player group state listener when entity is removed (#183273)

Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

homeassistant/components/group/media_player.py

@@ -259,8 +259,10 @@ class MediaPlayerGroup(MediaPlayerEntity):
         for entity_id in self._entities:
             new_state = self.hass.states.get(entity_id)
             self.async_update_supported_features(entity_id, new_state)
-        async_track_state_change_event(
-            self.hass, self._entities, self.async_on_state_change
+        self.async_on_remove(
+            async_track_state_change_event(
+                self.hass, self._entities, self.async_on_state_change
+            )
         )
         self.async_update_group_state()
         self.async_write_ha_state()

tests/components/group/test_media_player.py

@@ -657,3 +657,27 @@ async def test_service_play_media_kwargs(hass: HomeAssistant) -> None:
     mp_living_room.play_media.assert_called_with(
         "some_type", "some_id", announce=True, extra={"volume": 20}
     )
+
+
+async def test_state_listener_removed_with_entity(hass: HomeAssistant) -> None:
+    """Test the member state listener is removed when the group is removed."""
+    await async_setup_component(
+        hass,
+        MEDIA_DOMAIN,
+        {
+            MEDIA_DOMAIN: {
+                "platform": DOMAIN,
+                "entities": ["media_player.player_1", "media_player.player_2"],
+            }
+        },
+    )
+    await hass.async_block_till_done()
+
+    entity = hass.data[MEDIA_DOMAIN].get_entity("media_player.media_group")
+    await entity.async_remove()
+
+    assert entity.state is None
+    hass.states.async_set("media_player.player_1", STATE_ON)
+    await hass.async_block_till_done()
+
+    assert entity.state is None