Bad rendering of MapPolylines

QtLocation's MapPolylines seem to be rendered awfully, in specific the problems are:

1. Edges of polylines look jagged, even after setting opacity.

2. Polylines seem to be constructed of individual segments. In turns, these segments partially overlap, which causes an awful irregular striping effect when opacity is below one.

3. Line ends are square/butt, while round should be much better for routes.