emacs should warn before editing a backup~ file~

[Dan Jacobson]

"Why didn't my changes take effect?  Spoiled the presentation,
and the boss wasn't amused" I said to myself wistfully.
No wonder, emacs has let me go ahead and edit a backup file without
warning.  No wonder I now have a "~~" file:
Directory /etc/importaint/
config.fetching   config.fetching~  config.fetching~~
I must have mistyped it in, or mis-selected it in dired.  I didn't see
the tiny tilde and thought I was editing config.fetching.  Emacs ought
to have a variable, on by default, to warn upon find-file [not
read-only] of various backup files...

[uh oh, I bet Eli will defend the status quo here as usuual :-) ]
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