src/vs/editor/browser/viewParts/glyphMargin/glyphMargin.ts/GlyphMarginOverlay/render
class GlyphMarginOverlay:	public render(startLineNumber: number, lineNumber: number): string {
		if (!this._renderResult) {
			return '';
		}
		const lineIndex = lineNumber - startLineNumber;
		if (lineIndex < 0 || lineIndex >= this._renderResult.length) {
			return '';
		}
		return this._renderResult[lineIndex];
	}