This PR Fixes a loading performance regresssion inside the git graph.
The main issue is that we always acted on the received repository
events, this is good in 9 out of 10 cases except for the initial loading
phase of the git graph. This is because we invalidate the graph data
every time we receive a `GitStoreEvent::ActiveRepositoryChanged`,
`RepositoryEvent::BranchChanged` or `RepositoryEvent::MergeHeadsChanged`
event this still sounds good, but the caveat is that we receive these 3
events on initial repository loading. This happens when you start up Zed
and is getting the active repository, branch ect. from your project.
When it detects a repository/branch etc. it checks if it has been
changed and emits an event for it. This is always the case for initial
repository loading, because the active repository/branch always start as
**None**. So receive an event for these non actual changes makes the git
graph cancel its initial loading and start fetching again on every
invalidated graph data call.
We fixed this by checking the **scan_id** of the repo to check if the
repo has been initialized, if its bigger then 1 we know we need to
invalidate the data because it was a actual user change instead of a
initial loading event.
**Before** (note you see the loading state twice):
https://github.com/user-attachments/assets/c25bfae1-0e2f-4c8b-a0d0-926acb33adff
**After** (almost instant):
https://github.com/user-attachments/assets/7e4ac116-65a2-4eb6-aa4c-37291d6acd0f
-----
**Before** (switching repositories shows empty commits pane)
https://github.com/user-attachments/assets/71b04285-49e7-47bb-9660-ad53bbf15c46
**After** (switching repositories shows correct graph from the cache)
https://github.com/user-attachments/assets/38c33d93-f592-4440-b63b-567fda0fbeb8
Before you mark this PR as ready for review, make sure that you have:
- [x] Added a solid test coverage and/or screenshots from doing manual
testing
- [x] Done a self-review taking into account security and performance
aspects
- [x] Aligned any UI changes with the [UI
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
Release Notes:
- N/A
---------
Co-authored-by: Anthony <anthony@zed.dev>
Co-authored-by: Anthony Eid <hello@anthonyeid.me>
