bug#19565: Emacs vulnerable to endless-data attack (minor)

[Eli Zaretskii]

> From: Lars Ingebrigtsen <larsi@gnus.org>
> Cc: stefan@marxist.se,  19565@debbugs.gnu.org
> Date: Tue, 08 Oct 2019 18:27:15 +0200
> 
> So bytes/sec, as you suggest, may be the best heuristic.  But it should
> only kick in after having received a large number of bytes, probably.

Yes, I agree.  So maybe make it kick in once the process buffer is
large enough?  And even here we will need to consider, say, shell and
term.el buffers, which could grow quite large.