Re: [Bug] "You can't edit this part of the Custom buffer"

[Chong Yidong]

> No. Please read my bug report again. I said "has no effect". And I said
> "with no feedback". And that was the behavior at the time: nothing, nada,
> zip - no feedback to the user. You hit a key, and you see no effect and no
> message. I just retested, to be sure, BTW.

Revert the change to cus-edit.el to what it was before, and do the
following:

  emacs -q
  M-x customize-face RET font-lock-comment-face RET
  a

A message shows up in the echo area saying

  Text is read-only: "Attempt to change text outside editable field"