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It is often useful to remove unnecessary branches and states from a given history stream. The following extensions for maintaining states within history streams have various options for exactly what gets removed and from which history stream (if not the default).
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roll:delete-all-states
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Deletes all delta states
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roll:delete-following-states
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Deletes all delta states after the current delta state
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roll:delete-inactive-states
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Deletes all delta states not in the active path from the root to the current one
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roll:delete-previous-states
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Deletes all delta states before the current one
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