acp: Stay in edit mode when current completion ends (#36413)

When a turn ends and the checkpoint is updated, `AcpThread` emits
`EntryUpdated` with the index of the user message. This was causing the
message editor to be recreated and, therefore, lose focus.

Release Notes:

- N/A
db31fa67f3Agus Zubiaga committed on 8/18/2025, 2:37:28 PM· committed by GitHubparent6bf6669
4 files changedLine totals unavailable