bug#50733: 28.0.1; project-find-regexp can block Emacs for a long time

[Gregory Heytings]

> > > I agree with you on one point: it is perhaps possible to make rg even 
> > > faster with a database cache.
> >
> > Here's a relevant discussion: 
> > https://github.com/BurntSushi/ripgrep/issues/1497
>
> Yes, that would be a killer app: fast DB creation and lightning-fast 
> searches.

Indeed, if it is actually possible.  I'd be curious to see whether and how 
much a database would improve ripgrep's performance.  Using a database 
does not come for free.