Don't sync panel heights between the widget and render object inspector tabs

The widget panel's top/bottom are user specified widgets vs (I assume) all widgets connected to the current element tree. Since the bottom has more stuff, one would want to make the bottom half of the panel bigger.

On the render object panel, the bottom is just the render object's fields so the top part (the tree) is more interesting.

This make going back and forth between the tabs a bit more painful.

Perhaps another way to solve it is to keep the widget tab like the render object tab and have a separate button to toggle the visibility of non-user-created widget nodes.