Code review comment for lp:~diegosarmentero/unity8/disable-ui-on-actions

> The overlay shouldn't be a part of the preview, 'cause it can't be animated
> this way.
>
> If we only care about the action not being triggered twice, please leave just
> the MouseArea in and show no UI for it. Otherwise rebase on lp:~unity-
> team/unity8/switching-previews to get an overlay on top of previews that can
> be used.

Not entirely sure about this. would need to see how it looks on top of the switching-previews branch. Diego, can you please rebase it on that one and make sure it still looks good there?