bug#30943: save-hist creates massive cache file

[Eli Zaretskii]

> From: Glenn Morris <rgm@gnu.org>
> Cc: Chris Findeisen <cfindeisen@google.com>,  30943@debbugs.gnu.org
> Date: Tue, 27 Mar 2018 15:12:51 -0400
> 
> Eli Zaretskii wrote:
> 
> > Save-hist doesn't truncate any variables except the ones it knows
> > about, because it cannot be sure that truncating some list might leave
> > the variable with an invalid value.
> 
> savehist doesn't truncate anything AFAICS.

I meant savehist-trim-history.  Or maybe I misunderstand what you are
alluding to.