A rendering anomaly occurs with the given test document. The document lays out
eight circles and one text in a grid formation. Clicking the black rect will
increase the radius of the first circle by 10 units and relayout the grid.
After six or seven clicks on the black rect, the rendering problem occurs.
Steps to reproduce:
1. Load http://mcc.id.au/temp/2005/grid3.svg.
2. Click the black rect a few times.
3. Click the black rect a few more times. Notice the duplication of part of
the purple circle and the text.
This bug occurs with Batik 1.6 (and the trunk) but not with 1.5.1.
Unfortunately I'm not familiar with the rendering part of the code so I'm not
sure where to start looking.