[issue2393] hg diff should accept the -u option as a nop

[Javi]

New submission from Javi <cibervicho at gmail.com>:

Hi, this was reported in the Debian BTS ( http://bugs.debian.org/499910 ):

In order to be compatible with option settings of diff of rcs and cvs,
hg could simply ignore the -u option when given after 'diff' rather than
signaling an error.

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messages: 13695
nosy: vicho
priority: wish
status: unread
title: hg diff should accept the -u option as a nop

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