src/vs/workbench/contrib/notebook/browser/view/cellParts/markdownCell.ts/StatefulMarkdownCell/updateFoldingIconShowClass
class StatefulMarkdownCell:	private updateFoldingIconShowClass() {
		const showFoldingIcon = this.notebookEditor.notebookOptions.getLayoutConfiguration().showFoldingControls;
		this.templateData.foldingIndicator.classList.remove('mouseover', 'always');
		this.templateData.foldingIndicator.classList.add(showFoldingIcon);
	}