src/vs/workbench/contrib/files/browser/views/explorerViewer.ts/FilesRenderer/getAriaLevel
class FilesRenderer:	getAriaLevel(element: ExplorerItem): number {
		// We need to comput aria level on our own since children of compact folders will otherwise have an incorrect level	#107235
		let depth = 0;
		let parent = element.parent;
		while (parent) {
			parent = parent.parent;
			depth++;
		}

		if (this.contextService.getWorkbenchState() === WorkbenchState.WORKSPACE) {
			depth = depth + 1;
		}

		return depth;
	}