mapbox / mapbox/mapbox-gl-js

CustomSource tiles transition/fade duration issue

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bug :lady_beetle:
Dominant language
TypeScript
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Description

**mapbox-gl-js version**:
affected since 2.11, 2.12, 2.13 (2.10 doesn't have this behavior)
**browser**:
Chrome, FF, Android Chrome,
### Steps to Trigger Behavior

````ts
const customSource = {
type: 'custom',
dataType: 'raster',
id: 'customSource',
loadTile: async () => new ImageData(1, 1),
};
map.addSource(customSource.id, customSource);
map.addLayer({ id: 'rasterLayer', type: 'raster', source: customSource.id, paint: { 'raster-fade-duration': 0 } });
````
1. Create minimal Custom Source Demo
2. Add basic **rasterLayer** with prepared custom Source with `paint: { 'raster-fade-duration': 0 } `. Any small values of `'raster-fade-duration'` cause the unwanted effect. In my experiments values > 100 worked as expected.
3. Zoom in and out. Tiles from deeper levels remain.
4. Very big values `paint: { 'raster-fade-duration': 5000 } ` give similar effect, but in this case map panning removes unwanted tiles.

### Link to Demonstration

https://metoceanapi.github.io/wxtiles-mbox/bug4.html

### Expected Behavior

No tiles from deeper levels remain with `paint: { 'raster-fade-duration': 0 } `
As in MapBox v2.10

Contributor guide

Open the contributing guide

First steps

  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with the linked reproduction at metoceanapi.github.io/wxtiles-mbox/bug4.html and the custom-source example using map.addSource, map.addLayer, and raster-fade-duration. Reproduce the issue by zooming in and out with a fade duration of 0, then compare the behavior with Mapbox GL JS 2.10. Done means deeper-level tiles no longer remain after zooming.

Written by the indexing model from the issue text.

Assessment

Tech stack
typescript
Domain
frontend
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
35/100

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