Library used (support-v4, appcompat-v7, ...):
Version used: 27.0.2
Theme used: Theme.AppCompat.Light.DarkActionBar
Devices/Android versions reproduced on: Nexus 5X 8.1

If I set `setReorderingAllowed(true)` when doing fragment `hide()` and if there is a Visibility changing transition (`Fade` in my case) used as an exit on a fragment it internally sets all the views to `INVISIBLE` after the transition is over in `FragmentTransition.replaceHide`. But if you then press hardware back button, it attemts to build a list of views to fade back in, but that list is always empty because `FragmentTransitionImpl.captureTransitioningViews` always checks if they are `VISIBLE`. And I return back to a fragment with a bunch of INVISIBLE views.

- Relevant code to trigger the issue.
https://github.com/TheHiddenDuck/transition-bug-demo/blob/master/app/src/main/java/com/evilduck/fragmetntransitionbugdemo/MainActivity.java

- A screenrecord or screenshots showing the issue (if UI related).
https://drive.google.com/open?id=13gweoIhBkFdj66UhT0O3dO6hKc2UwMAM

- Steps to reproduce
Install demo app
click switch app
press back button to return to the first fragment
behold second fragment fade out instead of sliding down while underlying fragment becomes visible, but it's contents are INVISIBLE