Due to ARC, MGLOfflinePack can be deallocated at any time following its initialization. -dealloc ensures that the offline region observer is unset, but that step is asynchronous; there is no guarantee that it completes before the first status change update. In fact, the pack is deallocated before the first status change update unless it is captured outside of the MGLOfflinePackAdditionCompletionHandler. The pack nil check is unnecessary because the subsequent code would be a no-op.
This fixes an issue in both iOS and Android when e.g. adding a marker on
both sides of the dateline border in Taveuni island, the marker in one
of the sides would have an out-of-bounds longitude.
If gesture in progress, we transfer the world rounds from the end
longitude into start, so we can guarantee the "scroll effect" of
rounding the world while assuring the end longitude remains wrapped.
Otherwise, find the shortest path.
Simplify LatLng::{wrap,unwrapForShortestPath} code, avoiding duplicated
code between Transform::{latLngToScreenCoordinate,easeTo,flyTo}.
Added unit tests for camera usage in Transform to detect cases like e.g.
crossing the antimeridian as a shortest path between two coordinates.
Transform::flyTo precision loss to be handled in #4298.
Fixed a race condition that could occur if a progress update comes after a call to remove the task but before the removal is complete. Avoid synchronously setting the task’s state inside -resume and -suspend; instead, rely on the observer to set the state asynchronously.
Also categorized offline symbols for jazzy and moved styleURL from MGLOfflineRegion to MGLTilePyramidOfflineRegion, since you never know if there will be a region type not constrained by a style in the future.
Tapping on a download now pauses or resumes it. Tapping on a completed download navigates to the downloaded region and switches to the downloaded style.
Renamed SDK classes related to offline viewing to more closely match the terminology used by mbgl and the Android SDK while remaining consistent with Cocoa naming principles.
