src/vs/workbench/contrib/notebook/browser/notebookEditorWidget.ts/NotebookEditorWidget/_registerNotebookActionsToolbar
class NotebookEditorWidget:	private _registerNotebookActionsToolbar() {
		this._notebookTopToolbar = this._register(this.instantiationService.createInstance(NotebookEditorToolbar, this, this.scopedContextKeyService, this._notebookOptions, this._notebookTopToolbarContainer));
		this._register(this._notebookTopToolbar.onDidChangeState(() => {
			if (this._dimension && this._isVisible) {
				this.layout(this._dimension);
			}
		}));
	}