fix(web): normalizer understands tiptap's checkbox list

Author: hejsztynx

src/web/__tests__/htmlNormalizer.test.ts

@@ -417,6 +417,20 @@ describe('htmlNormalizer', () => {
     });
   });
 
+  describe('TiptapCheckboxList', () => {
+    test("tiptap's internal checkbox list structure gets correctly parsed", () => {
+      expect(
+        normalizeHtml(
+          `<ul data-type="checkboxList"><li data-checked="true" data-type="checkboxItem"><label>` +
+            `<input type="checkbox" checked="checked"><span></span></label><div><p>first</p></div></li>` +
+            `<li data-checked="false" data-type="checkboxItem"><label><input type="checkbox"><span></span></label><div><p>second</p></div></li></ul>`
+        )
+      ).toBe(
+        '<ul data-type="checkbox"><li checked>first</li><li>second</li></ul>'
+      );
+    });
+  });
+
   describe('BrRemappings', () => {
     test('inline collapses around <br> stay flat', () => {
       expect(

src/web/normalization/htmlNormalizer.ts

@@ -251,10 +251,15 @@ function emitAttributes(el: Element, name: string): string {
       );
     case 'ul': {
       const val = el.getAttribute('data-type');
-      return val === 'checkbox' ? ' data-type="checkbox"' : '';
+      return val === 'checkbox' || val === 'checkboxList'
+        ? ' data-type="checkbox"'
+        : '';
     }
     case 'li':
-      return el.hasAttribute('checked') ? ' checked' : '';
+      const isChecked =
+        el.hasAttribute('checked') ||
+        el.getAttribute('data-checked') === 'true';
+      return isChecked ? ' checked' : '';
     case 'mention':
       return (
         emitOneAttr(el, 'id') +