[iOS] Adding pitch messes up the bottom left corner pan gesture

[Lawris]

Hello,

When I increase the pitch of the mapView and make a pan gesture from the middle to the bottom left corner of the device, the velocity of the gesture seems to be exponentially calculated and the view is thrown away really far. This does not happen with the 3 other corners and only occurs with a pitch > 0.

Here is my basic configuration:

        mapView = MGLMapView(frame: view.bounds)
        mapView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
        mapView.delegate = self
        mapView.logoView.isHidden = true
        mapView.attributionButton.isHidden = true
        mapView.compassView.isHidden = true
        mapView.allowsRotating = true
        mapView.isPitchEnabled = true
        mapView.styleURL = MapViewStyleURL
        view.addSubview(mapView)

Steps to reproduce

1. Make a basic implementation of the mapView
2. Run and add some pitch
3. Drag from the middle to the bottom left corner

Expected behavior

Normal pan velocity.

Actual behavior

Way to high velocity.

Configuration

Mapbox SDK versions: 4.10
iOS/macOS versions: iOS 13 and 12
Device/simulator models: XS Max but tested on various simulators like iPhone 7
Xcode version: 11.2 beta (11B41)

[julianrex]

Thanks for the report @Lawris.

[julianrex]

@astojilj could this be a side-effect of recent changes?

[astojilj]

@astojilj could this be a side-effect of recent changes?

@julianrex Don't know when and if this is a regression.

[julianrex]

/cc @fabian-guerra

[jmkiley]

May be related to mapbox/mapbox-gl-native#5292

[knov]

Possibly related to mapbox/mapbox-gl-native#5292

[c941010623]

+1