src/vs/workbench/contrib/notebook/browser/viewModel/markupCellViewModel.ts/MarkupCellViewModel/_computeFoldHintHeight
class MarkupCellViewModel:	private _computeFoldHintHeight(): number {
		return (this.getEditState() === CellEditState.Editing || this.foldingState !== CellFoldingState.Collapsed) ?
			0 : this.viewContext.notebookOptions.getLayoutConfiguration().markdownFoldHintHeight;
	}