private static void onDragEntered(@Nonnull Region region, @Nonnull DragEvent event, @Nonnull FileDropListener listener) {
		listener.onDragEnter(region, event);
		event.consume();
	}
Pass drag-entering to listener.

@param region
		Region dragged over.
@param event
		Drag event.
@param listener
		Listener to call when drag enters.
recaf-ui/src/main/java/software/coley/recaf/ui/dnd/DragAndDrop.java