Fix java.lang.IllegalStateException: Design assumption violated.

Signed-off-by: alperozturk <alper_ozturk@proton.me>

app/src/main/java/com/owncloud/android/ui/preview/PreviewImageFragment.java

@@ -79,9 +79,7 @@ import androidx.core.content.ContextCompat;
 import androidx.core.content.res.ResourcesCompat;
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentManager;
-import androidx.fragment.app.FragmentStatePagerAdapter;
 import androidx.fragment.app.FragmentTransaction;
-import androidx.viewpager2.adapter.FragmentStateAdapter;
 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 import pl.droidsonroids.gif.GifDrawable;
 
@@ -128,7 +126,7 @@ public class PreviewImageFragment extends FileFragment implements Injectable {
      * This method hides to client objects the need of doing the construction in two steps.
      *
      * @param imageFile             An {@link OCFile} to preview as an image in the fragment
-     * @param ignoreFirstSavedState Flag to work around an unexpected behaviour of {@link FragmentStateAdapter} ;
+     * @param ignoreFirstSavedState Flag to work around an unexpected behaviour of { FragmentStateAdapter } ;
      *                                                           TODO better solution
      */
     public static PreviewImageFragment newInstance(@NonNull OCFile imageFile,

app/src/main/java/com/owncloud/android/ui/preview/PreviewImagePagerAdapter.kt

@@ -135,10 +135,6 @@ class PreviewImagePagerAdapter : FragmentStateAdapter {
         }
     }
 
-    override fun getItemId(position: Int): Long {
-        return imageFiles[position].hashCode().toLong()
-    }
-
     private fun addVideoOfLivePhoto(file: OCFile) {
         file.livePhotoVideo = selectedFile
     }