Small improvement

app/src/main/java/eu/faircode/email/FragmentMessages.java

@@ -3359,11 +3359,21 @@ public class FragmentMessages extends FragmentBase implements SharedPreferences.
                     @Override
                     protected Void onExecute(Context context, Bundle args) {
                         DB db = DB.getInstance(context);
+
+                        try {
+                            db.beginTransaction();
+
                             ArrayList<MessageTarget> result = args.getParcelableArrayList("result");
                             for (MessageTarget target : result) {
                                 Log.i("Move undo id=" + target.id);
                                 db.message().setMessageUiHide(target.id, 0L);
                             }
+
+                            db.setTransactionSuccessful();
+                        } finally {
+                            db.endTransaction();
+                        }
+
                         return null;
                     }