Nimbus scrollbar rendering glitch with xrender enabled on i945GM

FULL PRODUCT VERSION :
jdk8

ADDITIONAL OS VERSION INFORMATION :
fedora 16

EXTRA RELEVANT SYSTEM CONFIGURATION :
intel 945GM

A DESCRIPTION OF THE PROBLEM :
Under certain cirumstances, Nimbus scrollbars show rendering glitches when running on an i945GM using the latest intel driver.

Although this is a driver/hardware bug/limitation, the code-paths for billinear Blits are a bit fragile and rely on high transformation accuracy of the subjacent rendering subsystem.

I plan to rework certain parts of that code under the OpenJDK project, and use this bug report as placeholder.


REPRODUCIBILITY :
This bug can be reproduced occasionally.