Running the Ensemble8 demo with the Marlin renderer enabled, the "keystroke motion" example shows rendering anomalies on a "q" character.

To reproduce (running on MacOS 10.11 in retina mode):

- Run Ensemble8 demo with -Dprism.marlinrasterizer=true
- Click on the "Key Stroke Motion" example in the "Scenegraph" section
- Type a q
- The fill of the q character will flash and have dropouts

The problem does not occur with either the native or java-based pisces rasterizers...