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

[Eli Zaretskii]

> Date: Mon, 27 Sep 2021 19:36:54 +0000
> From: Gregory Heytings <gregory@heytings.org>
> cc: 50733@debbugs.gnu.org, dgutov@yandex.ru, mardani29@yahoo.es
> 
> >> Of course a table lookup is O(1) and a search is O(n).  If and only if 
> >> you forget the time it takes to build the table and to keep it up to 
> >> date.
> >
> > That time is irrelevant, because it doesn't delay the search.
> >
> 
> Of course it does.  The most important requirement of any search tool 
> (regexp or not) is that it must display results that correspond to the 
> current version of the files.  Even a daemon that watches the tree and 
> calls mkid in the background when files in the tree have changed isn't 
> enough, the results will regularly be wrong during N seconds (where N 
> depends on the size of the tree, for example, on my laptop, 30 for a 1 GB 
> tree).

And you always change your files in significant enough ways with such
frequency?  Then yes, IDUtils is probably not for you, too bad.