+ Added a Close listener to ProjectCustomizer.Category to enable + correct memory management when specific project properties are + to be maintained while Project Properties dialog is displayed, + containing various, possibly extended, categories. This is the case + with JWSProjectProperties and JFXProjectProperties, where cleanup + is needed at the time of dialog closing. The introduction of + a Close listener here actually enables to deprecate J2SECustomPropertySaver + interface and thus make the same mechanism available even outside + J2SE projects. +
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