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

[Dmitry Gutov]

On 04.03.2021 19:35, Gregory Heytings wrote:
> Just tried 'exact, it works, it's slow (but not horribly slow: 1.2 
> seconds on that 25 MB file)

1.2s is pretty slow for this purpose.

Otherwise it would be possible to use this approach (by introducing a 
Grep-specific location type) and avoid parsing the line contents for 
every match.

One downside would be missing on the syntax highlighting which we 
sometimes get for already-fontified parts of buffers, but it's 
unreliable anyway.