bug#13400: 23.4; overlapping process filter calls

[Noam Postavsky]

Eli Zaretskii <eliz@gnu.org> writes:

>> > - "37.9.2 Process Filter Functions" ignores the problem
>> >   completely. There should be a paragraph clearly stating this
>> >   problem. Further, it would be nice, if the filter function
>> >   example could be extended to correctly deal with this problem.
>> 
>> I added a mention of the possibility of recursion.  I'm not sure about
>> making an example (specifically, what is the best way to deal with this
>> problem?).
>
> I agree with Noam's decisions, and think that his patch is fine.
>
> Thanks.

Any thoughts about make-buffered-filter?  Leave it up to callers to
write their own most situation-appropriate version of it?  Add it as an
example to the manual?  Add it to Emacs?