Gets the source annotation container.
targetContainer: AnnContainer; // read-only
The target annotation container. This is the AnnContainer that is currently the target if the object is dropped. TargetContainer can be the same value as SourceContainer or can be null if the object is currently outside the boundary of all containers.
If the value is TargetContainer is null when the operation is AnnDragDropOperation.Drop then the default behavior is to cancel the drag/drop operation and return the object to its original position in SourceContainer.
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