Contain nested rows to grid

Contain nested rows to grid

If a row is nested inside of an expanded row, it should be contained to the grid unless the expanded class is explicitly added to the nested row.
If a nested row needs to be full width, the `expanded` class can be applied to that row; however, if nested row max-width is set to none, there's no way to contain a row to the grid inside of an expanded row.

This fixes #8886