Issue #72: Form items in jquery.ui dialogs broken (#73)

js/tinymce-integration.js

@@ -12,6 +12,14 @@
         $('<div id="tinymce-modal"/>').hide().appendTo('body');
       }
 
+      // Prevent jquery.ui dialog focusin handling breaking tox form elements.
+      $(document).on('focusin', function (event) {
+        // It's impossible to make this more specific because of split buttons.
+        if (element.form && element.form.classList.contains('layout-block-configure-form')) {
+          event.stopImmediatePropagation();
+        }
+      });
+
       let options = format.editorSettings.tiny_options;
       options.selector = '#' + element.id;
       // Prevent editor from changing urls, which mangles urls inserted via