Merge "keep androidx fragment through proguard optimization" into ub-launcher3-master

# support jar.

-keep class androidx.recyclerview.widget.RecyclerView { *; }

# Preference fragments

# Fragments

-keep class ** extends androidx.fragment.app.Fragment {

    public <init>(...);

}

-keep class ** extends android.app.Fragment {

    public <init>(...);

}