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bug#36967: 27.0.50; Duplicate lines in xref output

From: Dmitry Gutov
Subject: bug#36967: 27.0.50; Duplicate lines in xref output
Date: Thu, 8 Aug 2019 01:13:07 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0

On 08.08.2019 0:52, Juri Linkov wrote:
I tried to use project-find-regexp more often than rgrep,
but unfortunately xref still has a fundamental flaw:

0. emacs -Q
1. M-x project-find-regexp RET regexp RET
2. The output buffer *xref* contains duplicate lines
    when regexp is found on the same line several times,
    each duplicate output line has separate highlighting
    for every regexp occurrence.

I don't know how "fundamental" it is, but indeed, it's somewhat of a drawback. Suggestions for improving it (API change and/or implementation change) are welcome.

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