src/vs/workbench/contrib/notebook/browser/viewModel/notebookViewModel.ts/NotebookViewModel/find
class NotebookViewModel:	find(value: string, options: INotebookSearchOptions): CellFindMatchWithIndex[] {
		const matches: CellFindMatchWithIndex[] = [];
		this._viewCells.forEach((cell, index) => {
			const cellMatches = cell.startFind(value, options);
			if (cellMatches) {
				matches.push({
					cell: cellMatches.cell,
					index: index,
					matches: cellMatches.matches
				});
			}
		});

		return matches;
	}