Re: [PATCH v3] Allow applying filters to summary consecutively

[Eli Zaretskii]

> From: Richard Stallman <rms@gnu.org>
> Cc: andrea.monaco@autistici.org, rpluim@gmail.com, emacs-devel@gnu.org
> Date: Thu, 10 Nov 2022 23:36:15 -0500
> 
>   > Your guess is correct.  I was struggling with finding a good
>   > description for this.  What would you suggest as a good wording?
> 
> Well, how about "Using a summary filtering command when a filtered
> summary already exists"?
> 
> It may not be the best possible wordin, but at least it's correct and
> unambiguous.

That's okay, thanks.  But it's only the beginning of my problem.  How
do you describe the effect of applying a filter on top of one or more
other filters?  Andrea wants to use "intersection", but I tend to
think this is too "mathematical" and too vague to explain clearly what
happens.  What would be a good terminology for that?