fix: heading state remains when changed to paragraph in WYSIWYG (#2103)

* fix: heading element is not changed to paragraph when executing heading command with level 0

* chore: add test case(wysiwyg heading command)

apps/editor/src/__test__/unit/wysiwyg/wwCommand.spec.ts

@@ -85,6 +85,15 @@ describe('wysiwyg commands', () => {
 
       expect(wwe.getHTML()).toBe('<h6>foo</h6>');
     });
+
+    it('should change heading element to paragraph with level 0', () => {
+      setTextToEditor('foo');
+
+      cmd.exec('selectAll');
+      cmd.exec('heading', { level: 0 });
+
+      expect(wwe.getHTML()).toBe('foo');
+    });
   });
 
   describe('hr command', () => {

apps/editor/src/wysiwyg/nodes/heading.ts

@@ -48,7 +48,10 @@ export class Heading extends NodeSchema {
   }
 
   commands(): EditorCommand {
-    return (payload) => (state, dispatch) =>
-      setBlockType(state.schema.nodes.heading, payload)(state, dispatch);
+    return (payload) => (state, dispatch) => {
+      const nodeType = state.schema.nodes[payload!.level ? 'heading' : 'paragraph'];
+
+      return setBlockType(nodeType, payload)(state, dispatch);
+    };
   }
 }