Subject: 30.0.50; separator line in string-edit's *edit string* buffer can be deleted

From: Nicholas Vollmer <[email-masked]>
Date: Thu, 06 Jun 2024 11:55:01 -0400

1. emacs -q
2. eval (string-edit "test" "" #'ignore :abort-callback #'ignore)
3. In the "*edit string*" buffer delete-backward-char

Observe the separator line has been deleted.
Attempting to insert a character will user-error "Text is 
read-only".