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media/mod_multilangstatus/js/admin-multilangstatus.js

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+/**
+ * @copyright  (C) 2018 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license    GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+// We need to use JS to move the modal before the closing body tag to avoid stacking issues
+const multilangueModal = document.getElementById('multiLangModal');
+if (multilangueModal) {
+  const bsModal = bootstrap.Modal.getInstance(multilangueModal);
+  if (bsModal) {
+    bsModal.dispose();
+  }
+
+  // Append the modal before closing body tag
+  document.body.appendChild(multilangueModal);
+
+  // Modal was moved so it needs to be re initialised
+  Joomla.initialiseModal(multilangueModal);
+}