src/vs/workbench/contrib/notebook/browser/view/renderers/cellRenderer.ts/MarkupCellRenderer/updateForHover
class MarkupCellRenderer:	private updateForHover(element: MarkupCellViewModel, templateData: MarkdownCellRenderTemplate): void {
		templateData.container.classList.toggle('markdown-cell-hover', element.cellIsHovered);
	}