Nested expanded rows do not remove outer column padding with negative margin

[Joe-Withey]

I believe this was introduced in issue #7801.

When nesting expanded rows, the margin for each nested row is set to auto. Conversely if the rows do not have the expanded class then negative margin is set and the rows work correctly.

This leads to compound padding for each nested layer which is difficult to manage; should a user desire this behaviour it would be better to opt into it.

I've created a codepen to illustrate the issue.

[andycochran]

I think this is related to #8889. So, should be fixed in that patch.

[kball]

Fixed by #8889