Bugfix Add ActivityExtensions for Checking Dialog Fragments

[alperozturk96]

• Tests written, or not not needed

We have encountered an issue with dialog fragments where dismissing and showing them without checking their state leads to crashes for users. This PR addresses and resolves this problem.

Root cause of the problem

Exception java.lang.IllegalStateException: FragmentManager has been destroyed
  at androidx.fragment.app.FragmentManager.enqueueAction (FragmentManager.java:1666)
  at androidx.fragment.app.BackStackRecord.commitInternal (BackStackRecord.java:341)
  at androidx.fragment.app.BackStackRecord.commit (BackStackRecord.java:306)
  at androidx.fragment.app.DialogFragment.show (DialogFragment.java:524)

DialogFragment.java:524 this throws exception if isStateSaved() is true.

[github-actions]

Codacy

Lint

Type	master	PR
Warnings	70	70
Errors	3	3

SpotBugs

Category	Base	New
Bad practice	64	64
Correctness	69	69
Dodgy code	346	346
Experimental	1	1
Internationalization	7	7
Malicious code vulnerability	2	2
Multithreaded correctness	6	6
Performance	57	57
Security	19	19
Total	571	571

[github-actions]

APK file: https://www.kaminsky.me/nc-dev/android-artifacts/13075.apk



To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.

[alperozturk96]

/backport to stable-3.29