src/vs/editor/browser/viewParts/linesDecorations/linesDecorations.ts/LinesDecorationsOverlay/constructor
class LinesDecorationsOverlay:	constructor(context: ViewContext) {
		super();
		this._context = context;
		const options = this._context.configuration.options;
		const layoutInfo = options.get(EditorOption.layoutInfo);
		this._decorationsLeft = layoutInfo.decorationsLeft;
		this._decorationsWidth = layoutInfo.decorationsWidth;
		this._renderResult = null;
		this._context.addEventHandler(this);
	}