src/vs/editor/contrib/codelens/browser/codelensWidget.ts/CodeLensWidget/updateCodeLensSymbols
class CodeLensWidget:	updateCodeLensSymbols(data: CodeLensItem[], helper: CodeLensHelper): void {
		this._decorationIds.forEach(helper.removeDecoration, helper);
		this._decorationIds = [];
		this._data = data;
		this._data.forEach((codeLensData, i) => {
			helper.addDecoration({
				range: codeLensData.symbol.range,
				options: ModelDecorationOptions.EMPTY
			}, id => this._decorationIds[i] = id);
		});
	}