src/vs/editor/browser/viewParts/lineNumbers/lineNumbers.ts/LineNumbersOverlay/_readConfig
class LineNumbersOverlay:	private _readConfig(): void {
		const options = this._context.configuration.options;
		this._lineHeight = options.get(EditorOption.lineHeight);
		const lineNumbers = options.get(EditorOption.lineNumbers);
		this._renderLineNumbers = lineNumbers.renderType;
		this._renderCustomLineNumbers = lineNumbers.renderFn;
		this._renderFinalNewline = options.get(EditorOption.renderFinalNewline);
		const layoutInfo = options.get(EditorOption.layoutInfo);
		this._lineNumbersLeft = layoutInfo.lineNumbersLeft;
		this._lineNumbersWidth = layoutInfo.lineNumbersWidth;
	}