The drag-data-received signal is emitted on the drop
site when the dragged data has been received. If the data was received
in order to determine whether the drop will be accepted, the handler
is expected to call
drag_status and not finish
the drag. If the data was received in response to a
"drag-drop" signal (and this
is the last target to be received), the handler for this signal is
expected to process the received data and then call
drag_finish, setting the
success parameter depending on whether the data was processed successfully.
The handler may inspect and modify drag_context->action
before calling drag_finish,
e.g. to implement Gdk::ACTION_ASK.
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