Do not trigger fragment change when the activity was already closed

[planarvoid]

Fixes #10852

I've investigated this issue deeply but I couldn't find how it could be happening. It seems that the system gets the bottom nav click after onSaveInstanceState is called on the main activity. This shouldn't be possible. I think in this case it's safe to call commitAllowingStateLoss because we don't mind we lose the bottom nav position when the activity is being killed. It's better than crashing.

To test:

• Smoke test the bottom navigation

PR submission checklist:

• I have considered adding unit tests where possible.

• I have considered if this change warrants user-facing release notes and have added them to RELEASE-NOTES.txt if necessary.

[peril-wordpress-mobile]

You can test the changes on this Pull Request by downloading the APK here.

[malinajirka]

Thanks Vojta! ;) As we discussed I'm not a big fan of "commitAllowingStateLoss", but it seems reasonable to use it for this case. 🚢