src/vs/workbench/contrib/notebook/browser/contrib/outline/notebookOutline.ts/OutlineEntry/find
class OutlineEntry:	find(cell: ICellViewModel, parents: OutlineEntry[]): OutlineEntry | undefined {
		if (cell.id === this.cell.id) {
			return this;
		}
		parents.push(this);
		for (let child of this.children) {
			const result = child.find(cell, parents);
			if (result) {
				return result;
			}
		}
		parents.pop();
		return undefined;
	}