Index range of the slice that changed in the most recent data update. When set before calling InvalidateParentSurface(RangeMode,FieldDataDistributionArgs,Boolean), only that slice of the internal magnitude cache is recomputed, leaving the rest intact. The value is consumed (set to null) after each InvalidateParentSurface call. Ignored when IsFullReplace is true.

public IndexRange ChangedIndexRange {get; set;}