root cause: the `_prefTitle` is saved in `CharSequence` solution: we only able to store `CharSequence` since `Preference.getTitleRes` is removed in AndroidX. As a workaround, we update the title again on Fragment.onStart()
root cause: the `_prefTitle` is saved in `CharSequence` solution: we only able to store `CharSequence` since `Preference.getTitleRes` is removed in AndroidX. As a workaround, we update the title again on Fragment.onStart()