Prevent tree from being dragged out of bounds

[HagerDakroury]

According to #115 (comment) , a fallback solution was implemented to restrict the translateExtent of the tree.
That solution had other side effects and is now removed. So, a more proper way to handle this is needed.

Current Behaviour:

Expected Behaviour:

Zooming at any level should have some limit on dragging like this, to stop out-of-view dragging.