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

[Juri Linkov]

> Btw, I don't understand why we focus on general-purpose text-searching
> tools for these features.  Why not focus on packages like ID Utils
> instead, they are so much faster.  Daniel, could you time the same
> search in that large tree when xref-search-program is 'gid'?  (You'd
> need to run 'mkid' first, to create the ID database, but that is
> one-time, and is very fast.)  As I told many times, I think this is
> the future: program language sensitive tools that use a precomputed
> DB.

While we have the make target `make tags` that generates the tags database
in the Emacs source tree, for trying to use ID Utils I can't find
a similar target that would create the ID database.  Is its command line
more complex than etags?