FragmentActivity onRetainNonConfigurationInstance() retain FragmentManagerNonConfig

FragmentActivity.java

public final Object onRetainNonConfigurationInstance() {
        // Code

        FragmentManagerNonConfig fragments = mFragments.retainNestedNonConfig();
  
        // Code
        NonConfigurationInstances nci = new NonConfigurationInstances();
        nci.custom = custom;
        nci.viewModelStore = mViewModelStore;
        nci.fragments = fragments;
        return nci;
}