bug#13780: 24.2; Making find-file-hook customizable seems to cause troublle

[Stefan Kangas]

Eli Zaretskii <eliz@gnu.org> writes:

>> Stefan Monnier <monnier@iro.umontreal.ca> writes:
>>
>> >>> So until Custom is fixed to actually properly handle customisation of
>> >>> hooks (e.g. by storing "add functions foo, bar, and baz" rather than
>> >>> "ignore current value and just set it to (foo bar baz)").
>> >> This sentence seems to be missing its main clause…
>> >
>> > That's not just an appearance.  Its main clause is:
>> >
>> >    So until Custom ...blabla... I think it's better to use defcustom for
>> >    hooks very sparingly, i.e. only for those hook we can reasonably
>> >    expect will only be modified by the user's customization.
>
> IMO, this rationale is good for future additions, not for
> already-existing user options.  We cannot un-defcustom a user option
> just because someone became confused by some subtle use case.  This is
> the price we pay for the flexibility and power we have in Emacs.

Fine by me.