src/vs/workbench/contrib/notebook/browser/view/cellParts/markupCell.ts/MarkupCell/updateCollapsedState
class MarkupCell:	private updateCollapsedState() {
		if (this.viewCell.isInputCollapsed) {
			this.notebookEditor.hideMarkupPreviews([this.viewCell]);
		} else {
			this.notebookEditor.unhideMarkupPreviews([this.viewCell]);
		}
	}