src/vs/workbench/contrib/notebook/browser/view/renderers/markdownCell.ts/StatefulMarkdownCell/viewUpdateCollapsed
class StatefulMarkdownCell:	private viewUpdateCollapsed(): void {
		DOM.show(this.templateData.collapsedPart);
		DOM.hide(this.editorPart);
		DOM.hide(this.markdownContainer);
		this.templateData.container.classList.toggle('collapsed', true);
		this.viewCell.renderedMarkdownHeight = 0;
		this.viewCell.layoutChange({});
	}