Comment #11 on issue 185 by nlskrg: Memory leak - PActivityScheduler keeps
processed activities in reference
http://code.google.com/p/piccolo2d/issues/detail?id=185
The ArrayList activities may be modified while iterating over
processingActivities, e.g., a finished activity is removed. I
Comment #9 on issue 164 by allain.lalonde: PNode#moveToFront change to
avoid java.util.ConcurrentModificationException
http://code.google.com/p/piccolo2d/issues/detail?id=164
agreed
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