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

[Stefan Monnier]

>>> 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.

Slower than "\\s-+$"?


        Stefan