@bender-tags: 4.17.0, feature, 4462
@bender-ui: collapsed
@bender-ckeditor-plugins: wysiwygarea,toolbar,basicstyles,link,format,sourcearea,elementspath,undo

1. Switch to source mode and back to wysiwyg mode.

2. Reattach editor with double click on "Toggle" button.

3. Bold text with bold button.

**Expected:** There is a new undo step.

**Unexpected:** Editor does not record any undo step.
