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

[Richard Stallman]

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  > If I may, I would suggest something different: an option to query the user 
  > how they want the rmail-summary-by-* command to be applied: on the entire 
  > folder, to limit the existing summary, to extend the existing summary.

The first of these three options is not useful -- to get that result,
just type q before the command.  So there would be only two that are needed:
union and intersection.

C-u would be a natural way to specify this.

-- 
Dr Richard Stallman (https://stallman.org)
Chief GNUisance of the GNU Project (https://gnu.org)
Founder, Free Software Foundation (https://fsf.org)
Internet Hall-of-Famer (https://internethalloffame.org)