fix(preview-text-string-fragment): edit

[alperozturk96]

Issue

Thread creation was not life cycle aware and nullability needs to be checked

Exception in thread "Thread-75" java.lang.NullPointerException: Attempt to invoke interface method 'com.owncloud.android.ui.helpers.FileOperationsHelper com.owncloud.android.ui.fragment.FileFragment$ContainerActivity.getFileOperationsHelper()' on a null object reference
    at com.owncloud.android.ui.preview.PreviewTextStringFragment.lambda$edit$1(PreviewTextStringFragment.java:139)
    at com.owncloud.android.ui.preview.PreviewTextStringFragment.$r8$lambda$_MpHYWLzP65yyRQaF66kF_Bz0rY(Unknown Source:0)
    at com.owncloud.android.ui.preview.PreviewTextStringFragment$$ExternalSyntheticLambda0.run(D8$$SyntheticClass:0)
    at java.lang.Thread.run(Thread.java:1564)

Changes

• Replaces Java class with Kotlin uses LifecycleScope to make fully lifecycle aware and handle nullability
• Replaces hardcoded "Error" message with meaningful error message via translation support

[alperozturk96]

/backport to stable-33.1.0

[github-actions]

APK file: https://github.com/nextcloud/android/actions/runs/24727040649/artifacts/6557347597
To test this change/fix you can simply download above APK file and install and test it in parallel to your existing Nextcloud app.
(please click on link to get QR code displayed)

[github-actions]

Codacy

SpotBugs

Category	Base	New
Bad practice	35	35
Correctness	69	68
Dodgy code	224	222
Experimental	1	1
Internationalization	7	7
Malicious code vulnerability	2	2
Multithreaded correctness	34	34
Performance	42	42
Security	16	16
Total	430	427

[github-actions]

blue-Light-Screenshot test failed, but no output was generated. Maybe a preliminary stage failed.