getClusterExpansionZoom() is inaacurate with projections
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Description
**mapbox-gl-js version**: v2.6.0-beta.2
**browser**:Any
### Steps to Trigger Behavior
1. Use `http://localhost:9966/debug/cluster`
2. Set the projection `map.setProjection('equirectangular')` in the console
3. Click on a large cluser
### Link to Demonstration
on `equirectangular`:
https://user-images.githubusercontent.com/1449257/140556912-a35ae4bd-036e-4f1a-8501-30eb52d7cc04.mov
on `mercator`:
https://user-images.githubusercontent.com/1449257/140556931-b84096d2-fc62-4f88-ba0c-4337b6e095f3.mov
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the debug/cluster entry point and reproduce the reported behavior using map.setProjection('equirectangular') before clicking a large cluster. Trace getClusterExpansionZoom() for equirectangular and mercator projections, then verify the expansion zoom is accurate in both cases with regression coverage.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- typescript
- Domain
- frontend
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 38/100