Re: [Emacs-diffs] master c66aaa6: Recomplexify ‘delete-trailing-whitespace’ by treating \n as whitespace again

[Noam Postavsky]

On Wed, Mar 15, 2017 at 7:28 AM, Stefan Monnier
<address@hidden> wrote:
>>     Recomplexify ‘delete-trailing-whitespace’ by treating \n as
>>     whitespace again
>>
>>     Mostly reverts "Simplify ‘delete-trailing-whitespace’ by not treating
>>     \n as whitespace" from 2016-07-04.  Setting \n to non-whitespace
>>     causes the regex engine to backtrack a lot when searching for
>>     "\\s-+$" (Bug#26079).
>
> Why do we use syntax-tables?
> IOW why do we use \s- rather than something like [\s\t]?

No clue. But (re-search-forward "[\s\t]+$" nil t) is also slow.