- Split layout from the styles of the row
- Move command `.append-` `.prepend-` styles to bottom of source order
- Actually applies styles over others in more situations which is
probably what is expected when you add it to an element
- Also allows us to get rid of some styles that were trying to get
around this fact
See https://i.imgur.com/IE50PK6.png
Which is used in
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/15064
Design from https://gitlab.com/gitlab-org/gitlab-ce/issues/38464