src/vs/workbench/contrib/notebook/browser/viewModel/baseCellViewModel.ts/BaseCellViewModel/focusMode
class BaseCellViewModel:	set focusMode(newMode: CellFocusMode) {
		if (this._focusMode !== newMode) {
			this._focusMode = newMode;
			this._onDidChangeState.fire({ focusModeChanged: true });
		}
	}