This PR adds functionality for loading the diff for an arbitrary git
commit, and displaying it in a tab. To retrieve the diff for the commit,
I'm using a single `git cat-file --batch` invocation to efficiently load
both the old and new versions of each file that was changed in the
commit.
Todo
* Features
* [x] Open the commit view when clicking the most recent commit message
in the commit panel
* [x] Open the commit view when clicking a SHA in a git blame column
* [x] Open the commit view when clicking a SHA in a commit tooltip
* [x] Make it work over RPC
* [x] Allow buffer search in commit view
* [x] Command palette action to open the commit for the current blame
line
* Styling
* [x] Add a header that shows the author, timestamp, and the full commit
message
* [x] Remove stage/unstage buttons in commit view
* [x] Truncate the commit message in the tab
* Bugs
* [x] Dedup commit tabs within a pane
* [x] Add a tooltip to the tab
Release Notes:
- Added the ability to show past commits in Zed. You can view the most
recent commit by clicking its message in the commit panel. And when
viewing a git blame, you can show any commit by clicking its sha.
The language::markdown crate had been superceded by markdown::Mardown.
After #25117, the only two remaining use-cases were rendering git commit
messages (which are arguably not really markdown) and the signature help
(which is definitely not markdown).
Updated the former to use the new markdown component, and the latter to
do syntax highlighting manually.
Release Notes:
- Allow selecting the commit message in git commits
