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

[Gregory Heytings]

> With your approach we'll have to deal with interpreting Grep outputs 
> which list every line in the searched files. This will almost certainly 
> be slower in the case when there are only handful of matches. But 
> benchmarks welcome.

I don't know what you exactly need (I don't (yet?) use project), so I 
can't elaborate further or provide benchmarks alas.

Could you perhaps tell me what you need?