src/vs/editor/browser/viewParts/currentLineHighlight/currentLineHighlight.ts/AbstractLineHighlightOverlay/render
class AbstractLineHighlightOverlay:	public render(startLineNumber: number, lineNumber: number): string {
		if (!this._renderData) {
			return '';
		}
		const lineIndex = lineNumber - startLineNumber;
		if (lineIndex >= this._renderData.length) {
			return '';
		}
		return this._renderData[lineIndex];
	}