src/vs/workbench/contrib/notebook/browser/services/notebookExecutionStateServiceImpl.ts/NotebookExecutionStateService/_onCellExecutionDidChange
class NotebookExecutionStateService:	private _onCellExecutionDidChange(notebookUri: URI, cellHandle: number, exe: CellExecution): void {
		this._onDidChangeCellExecution.fire(new NotebookExecutionEvent(notebookUri, cellHandle, exe));
	}