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EVALUATION
The SynthTreeUI#paintContext field is initialized in the SynthTreeUI#paint method and used only while painting, so there is no need to keep it after painting. Moreover according javadoc of SynthContext: "A SynthContext should only be considered valid for the duration of the method it is passed to. In other words you should not cache a SynthContext that is passed to you and expect it to remain valid." Therefore that's a good reason to clear SynthTreeUI#paintContext after painting.