rem: Bool performDragOperation(WMView *self, WMDraggingInfo *info, WMData *data)
add: performDragOperation(WMView *self, WMDraggingInfo *info, WMData *data)
context: Bool performDragOperation(WMView *self, WMDraggingInfo *info,			  WMData *data){    char *file = (char*)WMDataBytes(data);    WMPoint pos;        pos = WMGetDraggingInfoImageLocation(info);     if (file!=NULL) {	WMLabel *label;	WMPoint pos2 = WMGetViewScreenPosition(self);		label = makeDraggableLabel(WMWidgetOfView(self), file, 				   pos.x-pos2.x, pos.y-pos2.y);	WMRealizeWidget(label);	WMMapWidget(label);    }        return True;}