src/vs/workbench/contrib/notebook/browser/viewModel/markupCellViewModel.ts/MarkupCellViewModel/startFind
class MarkupCellViewModel:	startFind(value: string, options: INotebookSearchOptions): CellFindMatch | null {
		const matches = super.cellStartFind(value, options);

		if (matches === null) {
			return null;
		}

		return {
			cell: this,
			matches,
			modelMatchCount: matches.length
		};
	}