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

首先复现 ask_user elicitation 表单中的提前按 Enter 和 Escape 流程，然后检查文本输入在提交和取消时的处理方式。完成的标准是长篇草稿不会被不可挽回地丢弃，并且所选择的提交行为清晰明确，且已针对意外按键进行了测试。