lazily update the focal point for location gesture handling #5801
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Description
The
NavigationScaleGestureHandlerused to update the focal point of the gesture plugin on each frame of the camera animation, and on each frame of the location puck's animation, which resulted in hundreds of calls toMapboxMap#pixelForCoordinateper second.This PR tries to lazily recalculate the focal point only when the map is actually interacted with.
cc @tobrun who noticed the increased number of calls to the projection API made by the SDK in general