bug#46859: 28.0.50; [PATCH]: Add option to truncate long lines in xref.el

[Dmitry Gutov]

On 03.03.2021 15:53, Gregory Heytings wrote:
> How so?  AFAICS, it's the exact same kind of output, except that it gets 
> truncated.  And it's (obviously?) better to see the context of the 
> pattern you are searching for, instead of the first characters of the 
> lines on which the pattern is found, in which the pattern might not be 
> present.

Since Grep doesn't return the column number of the match, we get it from 
parsing the string again. And if the string is now modified to be 
truncated from both sides, the column number will become wrong.