40382
14516 use an explicit copy of subclass collection in RBAbstractClass>>#allSubclasses	https://pharo.fogbugz.com/f/cases/1451612007 BorderMorph halo menu border colour broken	https://pharo.fogbugz.com/f/cases/1200714494 PSMCChangesGrouper is missing #visitClassTraitDefinition:	https://pharo.fogbugz.com/f/cases/14494

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