Don't scroll node into view if it's already fully in the view

[gaearon]

See here:

I wouldn't expect scroll to happen because all of these nodes are already into view. The jumping happens too often and I think it's a bit jarring.

Ideally we shouldn't jump if a node is already fully in the view.

[gaearon]

We'll release with this behavior but the plan is that @bvaughn will look into it next week after he's back from a vacation

[bvaughn]

Fixed via cca8b0c (PR #1112)