①If there is no item on the right, the focus is moved to the first item in next line.
②If there is no item on the left, the focus is moved to the last item in previous line.
③Looping is not supported. No actions by the left key on the leftmost side and by the right key on the rightmost side.
Naturally grouping nearby UI Elements for better readability.
Every individual item within the same group is separated.