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/** Returns a < b if sortOrder is Ascending, or b < a if order is descending */
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if (sortOrder == Qt::AscendingOrder)
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/** Returns the usual compare result of -1, 0, or 1 for lessThan, equals and greaterThan. */
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/** Takes a typical result from a compare method (0 is equal, -1 is less than, 1 is greater than)