ask_user  form: pressing Enter early submits/cancels and permanently discards the in-progress typed answer

Describe the bug

Severity: High (data loss — user-authored content is unrecoverable)

Impact: Loss of substantial user-typed input; forces the user to re-type from scratch and erodes trust in the form UI.

Suggested fixes: Draft autosave/restore for elicitation forms; make Enter insert a newline in text fields (submit via a distinct key like Ctrl+Enter); on cancel/escape, stash the draft (similar to  ctrl+s  stash/pop) rather than discarding it.

Affected version

GitHub Copilot CLI 1.0.83

Steps to reproduce the behavior

What happened: While typing a long free-text answer into an agent  ask_user  elicitation form, I pressed Enter before finishing. This submitted/advanced the form, and when I hit Escape to get back, my entire in-progress answer was erased with no way to recover it.

Expected behavior

Expected: Either (a) Enter in a multi-line form field should insert a newline (require an explicit submit action/confirmation to send), and/or (b) an accidental submit/escape should preserve the drafted text (e.g., restore it into the input buffer, or offer undo/ ctrl+r -style recovery). Long answers should never be silently, irrecoverably lost.

Additional context

No response

まず、ask_user の情報引き出しフォームで早い段階の Enter と Escape のフローを再現し、次に送信とキャンセルでテキスト入力がどのように処理されるかを調べます。長い下書きが取り返しのつかない形で破棄されず、選択した送信動作が明確で、キーの誤入力に対してテストされていれば完了です。