Tree nodes line up exactly under each other in the left-to-right orientation. However, the same nodes are slightly skewed to the side in the right-to-left orientation.

To duplicate:
1. run the SwingTest demo
2. select the Tree demo
3. select any look and feel
4. select right to left orientation

It appears that the drawing coordinates for expansion/contraction nodes and leaf nodes are not computed correctly. They appear to be several pixels off.