See D17222. D17209 accidentally broke setting IDs on ActionListView by converting it into a TagView: TagView already has an id property, and this new id property on the subclass shadows it.

Materially, the "Actions" mobile button in the headers of objects (for example: Maniphest Task -> shrink browser window -> click "Actions" next to task name) relies on setting IDs on list views.

• Viewed a task.
• Made browser window narrow.
• Clicked [= Actions] button.
• After patch: saw a dropdown menu.