src/vs/workbench/contrib/notebook/browser/contrib/cellStatusBar/executionStatusBarItemController.ts/NotebookStatusBarController/_updateEverything
class NotebookStatusBarController:	private _updateEverything(): void {
		this._visibleCells.forEach(dispose);
		this._visibleCells.clear();
		this._updateVisibleCells({ added: this._observer.visibleCells, removed: [] });
	}