Do not create another dialog with the same custom view - reuse the old one (commons-app#3097)

* Clear parent from customView if parent is not null

* Do not create a new dialog when a dialog with a custom view already exists on resume

* remove debug code from dialog custom view parent investigation

* Add rest file

* Didn't mean to add that test file

Author: albendz

app/src/main/java/fr/free/nrw/commons/utils/DialogUtil.java

@@ -116,6 +116,13 @@ private static void showAlertDialog(Activity activity,
                                         final Runnable onNegativeBtnClick,
                                         View customView,
                                         boolean cancelable) {
+        // If the custom view already has a parent, there is already a dialog showing with the view
+        // This happens for on resume - return to avoid creating a second dialog - the first one
+        // will still show
+        if (customView != null && customView.getParent() != null) {
+            return;
+        }
+
         AlertDialog.Builder builder = new AlertDialog.Builder(activity);
         builder.setTitle(title);
         builder.setMessage(message);