New 'updateMapboxSource()' utility function

[ahocevar]

Fixes #1008.

updateMapboxSource(mapOrGroup, id, mapboxSource): Promise<Source>

Updates a Mapbox source object in the style. The according OpenLayers source will be replaced
and the map will be re-rendered.

Parameters

Name	Type	Description
mapOrGroup	Map | LayerGroup	The Map or LayerGroup apply was called on.
id	string	Key of the source in the sources object literal.
mapboxSource	any	Mapbox source object.

Returns

Promise<Source>

Promise that resolves when the source has been updated.

[ahocevar]

@simonseyock, do you want to see if this supports your use case?

[simonseyock]

Sorry for not responding, I will test this in this week.

[simonseyock]

@ahocevar I finally was able to test this. It works really nice, but there is one problem: Sometimes I would want to update a source and a layer at the same time. This causes two renders, where one is in an incomplete state.

I have ways to circumvent this, and probably do not have time in the project anymore to test any proper solutions for this problem. Wanted to report my findings anyways.