QGeoCircle bounding box calculated incorrectly in QDeclarativeGeoMap

QDeclarativeGeoMap::fitViewportToGeoShape currently calculates the extent of a QGeoCircle bounding box using the center and the position "centerCoordinate.atDistanceAndAzimuth(circle.radius(), 90);"

This is correct only for circles centered at the equator.

Example of failing geometries:

MapRectangle {
    color: 'blue'
    opacity: 0.4
    topLeft: QtPositioning.coordinate(84,-22)
    bottomRight: QtPositioning.coordinate(72,-18)
}

MapCircle {
    color: 'red'
    opacity: 0.4
    center: QtPositioning.coordinate(70,70)
    radius: 1800000
}