rem: free(command);
add: wfree(command);
context: updateDNDCommand(WAppIcon *icon, char *command){    if (icon->dnd_command)	free(icon->dnd_command);    if (command && (command[0]==0 || (command[0]=='-' && command[1]==0))) {	free(command);	command = NULL;    }    icon->dnd_command = command;}