Fixes https://github.com/zed-industries/zed/issues/9575
Fixes https://github.com/zed-industries/zed/issues/4294
### Problem
When a large git repository's `.git` folder changes (due to a `git
commit`, `git reset` etc), Zed needs to recompute the git status for
every file in that git repository. Part of computing the git status is
the *unstaged* part - the comparison between the content of the file and
the version in the git index. In a large git repository like `chromium`
or `linux`, this is inherently pretty slow.
Previously, we performed this git status all at once, and held a lock on
our `BackgroundScanner`'s state for the entire time. On my laptop, in
the `linux` repo, this would often take around 13 seconds.
When opening a file, Zed always refreshes the metadata for that file in
its in-memory snapshot of worktree. This is normally very fast, but if
another task is holding a lock on the `BackgroundScanner`, it blocks.
### Solution
I've restructured how Zed handles Git statuses, so that when a git
repository is updated, we recompute files' git statuses in fixed-sized
batches. In between these batches, the `BackgroundScanner` is free to
perform other work, so that file operations coming from the main thread
will still be responsive.
Release Notes:
- Fixed a bug that caused long delays in opening files right after
performing a commit in very large git repositories.
f7a86967fd