bug#19896: 23.1; reverse-region is slow compared to sort-columns

[Ivan Shmakov <ivan@siamics.net>]

>>>>> Eli Zaretskii <eliz@gnu.org> writes:
>>>>> From: Ivan Shmakov  Date: Wed, 18 Feb 2015 18:29:08 +0000

[…]

 >> On a GNU system (as well as on any other system featuring GNU
 >> Coreutils), it should be possible to just use sort(1) for the
 >> purpose.  For instance, the “reverse” option is ‘-r’.

 > But sort(1)'s sort order is locale-specific, whereas that of Emacs
 > isn't.

	How is that a disadvantage?  The user can easily force any
	locale of those available on the system with an explicit
	LC_ALL=, like:

$ LC_ALL=de_DE.UTF-8 sort < list.de 

$ LC_ALL=ru_RU.UTF-8 sort < list.ru 

$ LC_ALL=C sort < list.ascii 

	For one thing, M-x sort-lines seems to put ё after я, while in
	Russian it comes between е and ж.  And similarly for ß (and the
	accented letters) in German, etc.

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