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David Thompson authored
Handle the case when descriptive phrases belonging to the same parent item refer to the same persistent object. For now, assume that the same object should only appear once per parent. In the future, other phrase information should be used to discriminate phrases. This fixes the issue where the associated-entity list would be cleared immediately after an operation ran -- not because the operation removed existing objects, but because new phrases were constructed that did not match the old phrase (causing a removal and insertion of the same object, which reset the map used to hold selected objects).
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