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Re: [Emacs-diffs] master c66aaa6: Recomplexify ‘delete-trailing-whitespa

From: Stefan Monnier
Subject: Re: [Emacs-diffs] master c66aaa6: Recomplexify ‘delete-trailing-whitespace’ by treating \n as whitespace again
Date: Wed, 15 Mar 2017 10:50:14 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.0.50 (gnu/linux)

>>> 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-+$"?


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