hack summernote to consider action-text-attachment as block tag

app/assets/javascripts/admin.js

@@ -10,7 +10,6 @@
 //= require appstack/app
 //= require gdpr/cookie_consent
 //= require trix
-//= require summernote/summernote-bs5.min
 //= require sortablejs/Sortable
 //= require popper
 //= require summernote/summernote-lite

app/assets/javascripts/admin/plugins/summernote.js

 /* eslint no-alert: 'off' */
-/*global $, SummernoteAttachment, SummernoteAttachmentUpload */
-// window.osuny.summernote.sendFile = function (file, toSummernote) {
-//     'use strict';
-//     var data = new FormData();
-//     data.append('file', file);
-//     $.ajax({
-//         data: data,
-//         type: 'POST',
-//         headers: { 'X-CSRF-TOKEN': $('meta[name="csrf-token"]').attr('content') },
-//         url: '/admin/summernote_blobs',
-//         cache: false,
-//         contentType: false,
-//         processData: false,
-//         success: function (successData) {
-//             if (typeof successData.errors !== 'undefined' && successData.errors !== null) {
-//                 return $.each(successData.errors, function (errorKey, messages) {
-//                     return $.each(messages, function (messageKey, message) {
-//                         return window.alert(message);
-//                     });
-//                 });
-//             }
-//             return toSummernote.summernote('pasteHTML', successData.node);
-//         }
-//     });
-// };
-//
-
+/*global $, SummernoteAttachmentUpload */
 $(function () {
     'use strict';
 
@@ -34,6 +8,21 @@ $(function () {
         dropImage: 'Drop file'
     });
 
+    $.summernote.dom.isAttachment = function (node) {
+        return node && (/^ACTION-TEXT-ATTACHMENT/).test(node.nodeName.toUpperCase());
+    };
+
+    $.summernote.dom.isInline = function (node) {
+        return !this.isBodyContainer(node) &&
+         !this.isList(node) &&
+         !this.makePredByNodeName('HR')(node) &&
+         !this.isPara(node) &&
+         !this.makePredByNodeName('TABLE')(node) &&
+         !this.makePredByNodeName('BLOCKQUOTE')(node) &&
+         !this.makePredByNodeName('DATA')(node) &&
+         !this.isAttachment(node);
+    };
+
     $('[data-provider="summernote"]').each(function () {
         $(this).summernote({
             popover: {

app/assets/javascripts/admin/plugins/summernote_attachment_upload.js

-    /*global $, ActiveStorage, SummernoteAttachment */
+/*global $, ActiveStorage */
 var SummernoteAttachmentUpload = function (element, file) {
     'use strict';
     this.element = element;