Whole tree slowly rotates

[GoogleCodeExporter]

What is the expected output? What do you see instead?
Expected: tree should stay in the same position, so after tree is balanced 
after an insert the system does not rotate any more
Actual: esp when doing big inserts it seems the whole system retains a certain 
amount of rotational inertia which causes it to spin slowly. 

What version of the product are you using? On what operating system?
0.40

Original issue reported on code.google.com by [email protected] on 1 Oct 2013 at 10:13