src/vs/workbench/contrib/notebook/browser/viewModel/cellSelectionCollection.ts/NotebookCellSelectionCollection/setFocus
class NotebookCellSelectionCollection:	setFocus(selection: ICellRange | null, forceEventEmit: boolean, source: 'view' | 'model') {
		this.setState(selection, this._selections, forceEventEmit, source);
	}