[gnu.emacs.bug] backup-buffer queries user while file is removed

perm@MIZAR.DOCS.UU.SE (Per Mildner) (12/11/89)

In GNU Emacs 18.55.5 of Thu Dec  7 1989 on mizar (berkeley-unix)

backup-buffer should ask the user about deleting excess versions of a
file BEFORE it touches the file (specifically before it rename to
another name). Doing the query earlier prevents important files from
being nonexistent for a long time if user does't answer.