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The pattern used in KeysChildren implementation - getIndex() calling createIndex() - is used in various parts of the IDE. I think it would be better to make the creation method protected and not final so that derived classes don't need to override getIndex() with basically the same logic.
As you wish. Changed in main trunk.
Resolved for 3.4.x or earlier, no new info since then -> verified
Resolved for 3.4.x or earlier, no new info since then -> closing.