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EVALUATION
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Also, I came across comments from people complaining about increased memory usage in 6u14. This was due to many duplicate DerivedColor objects. E.g. a button painter allocates some 50 colors, and we create 10 instances for 10 states, so we get 500 colors where we only need 50.
To address this, i've updated my fix slightly: now derived colors are cached and reused.