[Header] Attached inverted variant should not have negative margin if :first-child

[tpinne]

If an attached inverted header is the first element inside a grid column it is slightly misaligned to the first element of the other columns because of the negative margin.

See http://jsfiddle.net/6tf79jh7/1/ for demo. Make sure to size the browser so that the columns sit next to each other to see the little difference.

[stale]

There has been no activity in this thread for 90 days. While we care about every issue and we’d love to see this fixed, the core team’s time is limited so we have to focus our attention on the issues that are most pressing. Therefore, we will likely not be able to get to this one.

However, PRs for this issue will of course be accepted and welcome!

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