Unable to turn on user location tracking immediately at startup

[1ec5]

Currently it doesn’t seem possible for an app to turn on MGLUserTrackingModeFollowWithHeading at startup, because -[MGLMapView setUserTrackingMode:animated:] goes and resets the mode to MGLUserTrackingModeNone if self.userLocation.coordinate is invalid. The coordinate is invalid from startup until we receive the first location update. And setting MGLUserTrackingModeFollow at startup doesn’t quite work either: we pan and zoom to the current location but immediately stop following after that.

[1ec5]

The workaround is to first set a valid center coordinate. That’s a pretty sensible workaround, so I don’t think this bug is important for beta 1.

[incanus]

Pretty sure this is obsolete, but needs testing.

[1ec5]

Still reproduces. Without setting a center coordinate, set the user tracking mode. Nothing happens.

[1ec5]

This is probably stale now, given that -commonInit does set a center coordinate these days.

[friedbunny]

Tried this on #3680's branch — plain follow is now possible, but heading and course modes both knock down to follow because the heading isn't valid yet.

[1ec5]

heading and course modes both knock down to follow because the heading isn't valid yet.

A fix is ready in #3680.