if (parent.currentItem == this) return;
void clear () {	if (cached || (parent.style & SWT.VIRTUAL) == 0) {		int columnCount = OS.gtk_tree_model_get_n_columns (parent.modelHandle);		for (int i=0; i<columnCount; i++) {			OS.gtk_list_store_set (parent.modelHandle, handle, i, 0, -1);		}	}	cached = false;	font = null;	cellFont = null;}