[bug-diffutils] Bug#625630: diffutils: diff --ignore-matching-lines doesn't ignore newlines if they near a different line (fwd)

[Santiago Vila]

Hello.

Received this from the Debian bug system.

Sorry for the delay in processing it. I have checked and it may still be
reproduced with diffutils 3.0.50 from git.

Thanks.

---------- Forwarded message ----------
From: Bekir Dogan <address@hidden>
To: Debian Bug Tracking System <address@hidden>
Date: Wed, 04 May 2011 19:30:37 +0300
Subject: Bug#625630: diffutils: diff --ignore-matching-lines doesn't ignore
    newlines if they near a different line

Package: diffutils
Version: 1:3.0-1
Severity: normal


This example reports nothing different, really ignores lines with 'xxx' as 
expected:
$ /usr/bin/diff --ignore-matching-lines='^xxx.*$' <(echo -e 
'aaa\nbbb\nccc\nddd\nxxx\neee\nxxx\nfff') <(echo -e 
'aaa\nbbb\nccc\nddd\neee\nfff')

But this example reports the first 'xxx' line as difference near the other 
different line ('y'), and does not report the second 'xxx' line:
$ /usr/bin/diff --ignore-matching-lines='^xxx.*$' <(echo -e 
'aaa\nbbb\nccc\nddd\nxxx\ny\neee\nxxx\nfff') <(echo -e 
'aaa\nbbb\nccc\nddd\neee\nfff')
5,6d4
< xxx
< y

Expected result should be like this:
$ /usr/bin/diff --ignore-matching-lines='^xxx.*$' <(echo -e 
'aaa\nbbb\nccc\nddd\nxxx\ny\neee\nxxx\nfff') <(echo -e 
'aaa\nbbb\nccc\nddd\neee\nfff')
6d5
< y

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