Cannot scroll subgrid with mousewheel without scrolling parent grid

[c0bra]

If you attempt to scroll in a sub-grid with the mouse wheel it will also (improperly) scroll the parent grid.

You can see the behavior in this plunker: http://plnkr.co/edit/YGlX5XltCzMgZ1fOAO33?p=preview

[PaulL1]

I'm downgrading this from hi-pri on the basis that I think we're going to release ui-grid with expandable still being beta. There are a lot of issues still outstanding in expandable and I think we want to focus on getting the core stable first.

[jpuri]

This looks like duplicate of #2162.

[c0bra]

@jpuri doh, you're right. Closing as a dupe.