Fix toolbar in PreviewMediaFragment after coming back from sharing fragment

Signed-off-by: Álvaro Brey Vilas <alvaro.brey@nextcloud.com>

src/main/java/com/owncloud/android/ui/activity/FileDisplayActivity.java

@@ -2230,9 +2230,7 @@ public class FileDisplayActivity extends FileActivity
             showSortListGroup(false);
             Fragment mediaFragment = PreviewMediaFragment.newInstance(file, user.get(), startPlaybackPosition, autoplay);
             setLeftFragment(mediaFragment);
-            binding.rightFragmentContainer.setVisibility(View.GONE);
-            ((CoordinatorLayout.LayoutParams) binding.rootLayout.getLayoutParams()).setBehavior(null);
-            super.updateActionBarTitleAndHomeButton(file);
+            configureToolbarForMediaPreview(file);
         } else {
             Intent previewIntent = new Intent();
             previewIntent.putExtra(EXTRA_FILE, file);
@@ -2245,6 +2243,13 @@ public class FileDisplayActivity extends FileActivity
         }
     }
 
+    public void configureToolbarForMediaPreview(OCFile file) {
+        showSortListGroup(false);
+        binding.rightFragmentContainer.setVisibility(View.GONE);
+        ((CoordinatorLayout.LayoutParams) binding.rootLayout.getLayoutParams()).setBehavior(null);
+        super.updateActionBarTitleAndHomeButton(file);
+    }
+
     /**
      * Starts the preview of a text file {@link OCFile}.
      *

src/main/java/com/owncloud/android/ui/preview/PreviewMediaFragment.java

@@ -64,6 +64,8 @@ import com.owncloud.android.lib.common.operations.RemoteOperationResult;
 import com.owncloud.android.lib.common.utils.Log_OC;
 import com.owncloud.android.ui.activity.DrawerActivity;
 import com.owncloud.android.ui.activity.FileActivity;
+import com.owncloud.android.ui.activity.FileDisplayActivity;
+import com.owncloud.android.ui.activity.ToolbarActivity;
 import com.owncloud.android.ui.dialog.ConfirmationDialogFragment;
 import com.owncloud.android.ui.dialog.RemoveFilesDialogFragment;
 import com.owncloud.android.ui.fragment.FileFragment;
@@ -180,7 +182,9 @@ public class PreviewMediaFragment extends FileFragment implements OnTouchListene
 
         emptyListView = binding.emptyView.emptyListView;
 
-        getActivity().findViewById(R.id.sort_list_button_group).setVisibility(View.GONE);
+        if(getActivity() instanceof FileDisplayActivity){
+            ((FileDisplayActivity) getActivity()).configureToolbarForMediaPreview(getFile());
+        }
 
         setLoadingView();
         return view;