Thanks! It does look better, performance-wise.
Would you say that the performance of project--vc-list-files could be
similarly improved for Hg? Or does the Rust implementation in question
already get used for 'hg status .', as long as there is no "re:"
involved?
As of very recently in Mercurial trunk, yes, the Rust implementation
will be used for project--vc-list-files. (It only just got support for
-0)
Although note: currently the Rust implementation doesn't support "hg
status somefile"; that will fall back to the Python implementation. So
"hg status ." would be slow, actually, but "hg status" (as
project--vc-list-files inexplicably seems to do, despite passing "." for
file-or-list, based on inspecting with (vc-edit-next-command)) is fast.
(either way though, I'm working on making "hg status somefile" work in
Rust, since that will make vc-hg-state fast)