src/vs/workbench/contrib/notebook/browser/contrib/editorStatusBar/editorStatusBar.ts/ActiveCellStatus/_update
class ActiveCellStatus:	private _update() {
		this._itemDisposables.clear();
		const activeEditor = getNotebookEditorFromEditorPane(this._editorService.activeEditorPane);
		if (activeEditor) {
			this._itemDisposables.add(activeEditor.onDidChangeSelection(() => this._show(activeEditor)));
			this._itemDisposables.add(activeEditor.onDidChangeActiveCell(() => this._show(activeEditor)));
			this._show(activeEditor);
		} else {
			this._accessor.clear();
		}
	}