src/vs/workbench/contrib/codeEditor/browser/outline/documentSymbolsTree.ts/DocumentSymbolRenderer/renderTemplate
class DocumentSymbolRenderer:	renderTemplate(container: HTMLElement): DocumentSymbolTemplate {
		container.classList.add('outline-element');
		const iconLabel = new IconLabel(container, { supportHighlights: true });
		const iconClass = dom.$('.outline-element-icon');
		const decoration = dom.$('.outline-element-decoration');
		container.prepend(iconClass);
		container.appendChild(decoration);
		return new DocumentSymbolTemplate(container, iconLabel, iconClass, decoration);
	}