Fix content jump on validator

[mwaddoups]

Right now there is a bit of a content jump when we load in new content. It's not a major issue but would be nice to fix from a usability perspective.

[mwaddoups]

This is now much improved, by

• Increasing the initial size of the selector
• Scrolling to top on entering the validator

This will still happen if the user focuses on the bottom end of the validator - but frankly this makes sense.