Explanation about when does onActivityCreated method not called

[lujop]

Can you explain what is fragment restart and why onActivityCreated is not called in it?
I've tried with latest v4 support version 23.3.0 and I can't reproduce the case where onActivityCreated isn't called.

Here is some discussion about that:
http://stackoverflow.com/questions/36858835/onactivitycreated-is-always-called/36858971?noredirect=1#comment61291313_36858971

[nick1Jian]

My guess is that in some rare cases, the fragment called onDestroyView() but the activity is not yet destroyed. When frag is resumed, the fragment still attached to activity hence no need to call on ActivityCreated()

But that's just my guess. Need more reference to prove that.