src/vs/workbench/contrib/notebook/browser/view/renderers/cellRenderer.ts/MarkupCellRenderer/updateCollapsedState
class MarkupCellRenderer:	private updateCollapsedState(element: MarkupCellViewModel) {
		if (element.metadata.inputCollapsed) {
			this.notebookEditor.hideMarkupPreviews([element]);
		} else {
			this.notebookEditor.unhideMarkupPreviews([element]);
		}
	}