bug#29659: 25.2; better rmail-summary-by-topic

[Eli Zaretskii]

> Date: Mon, 11 Dec 2017 13:28:12 +0100
> From: Francesco Potortì <pot@gnu.org>
> 
> rmail-summary-by-topic functionality can be easily improved by this
> piece of advice:
> 
> (defun rmail-simplified-subject--strip-all (subject)
>   "Strip all prefixes like Re:, Fwd: and similar ones"
>   (let ((search-spaces-regexp "[ \t\n]"))
>     (string-match " *\\(\\(\\w\\{1,3\\}:\\|\\[.+]\\) +\\)*" subject)
>     (replace-match "" t t subject))
>   )
> (advice-add 'rmail-simplified-subject :filter-return 
> #'rmail-simplified-subject--strip-all)
> 
> 
> Maybe this can be simply incorporated into rmail-simplified-subject: it
> is able to remove prefixes like
> 
> Re: [Topic] Fwd: Re: Fwd:
> 
> and in practice I find it very useful

Indeed, and so I wonder why did you need the advice?  Which prefixes
does rmail-simplified-subject not handle correctly?

Thanks.