Don't branch conversations when editing the last prompt

What variant of Codex are you using?

CLI

What feature would you like to see?

Since 0.145.0, editing an earlier prompt always branch conversation.

However, there are two situations where we need to edit the last prompt:

1. To fix a spelling error.

1. To retry when the task is interrupted (due to a network error) by pressing Esc->Esc->Enter.

Additional information

_No response_