Sent by the drop target in response to SEL_DND_DROP. The drag action should be the same as the action the drop target reported to the drag source in reponse to the SEL_DND_MOTION message. This function notifies the drag source that its part of the drop transaction is finished, and that it is free to release any resources involved in the drag operation. Calling dropFinished() is advisable in cases where the drop target needs to perform complex processing on the data received from the drag source, prior to returning from the SEL_DND_DROP message handler.
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