This avoids a problem where the operating system would drop events
on the floor and tell us to rescan the entire directory, which in turn
would cause a flicker in the project browser.
Co-Authored-By: Nathan Sobo <nathan@zed.dev>
Also, move the high-level fuzzy mathcing functions in
zed::fuzzy into the fuzzy crate so that project can
use them.
This required defining a 'PathMatchCandidateSet' trait
to avoid a circular dependency from fuzzy to worktree.
Co-Authored-By: Nathan Sobo <nathan@zed.dev>
