src/vs/workbench/contrib/notebook/common/notebookOptions.ts/NotebookOptions/computeCollapsedMarkdownCellHeight
class NotebookOptions:	computeCollapsedMarkdownCellHeight(viewType: string): number {
		const { bottomToolbarGap } = this.computeBottomToolbarDimensions(viewType);
		return this._layoutConfiguration.markdownCellTopMargin
			+ this._layoutConfiguration.collapsedIndicatorHeight
			+ bottomToolbarGap
			+ this._layoutConfiguration.markdownCellBottomMargin;
	}