bug#23276: 25.0.92; Crash in auto-revert when file no longer present

[Óscar Fuentes]

Eli Zaretskii <eliz@gnu.org> writes:

>> > And I still am not convinced that deleting a file under auto-revert
>> > shouldn't erase its buffer. Otherwise, it sounds like just
>> > half-auto-revert to me. Would we keep the buffer non-empty if the
>> > file existed but was empty?
>> 
>> I would not want it to erase the buffer. Countless have been the times that
>> I've been working on a project, and an unbridled rm took away code from the
>> disk which I was very grateful to find was still in a buffer.
>
> How is it different from clobbering a file by making it empty?

$ echo hello > foo.txt

$ emacs -Q foo.txt &

M-x auto-revert-mode

$ echo -n > foo.txt

M-x undo

Clobbering a file doesn't imply that you lose its previous contents.