title: CKEDITOR 4 How to make snapshot before using custom command to use CTRL+Z to undo
body: <p>Problem is following:</p>
  
  <p>We have custom block element, such as quote.</p>
  
  <p>We want to have a possibility to "CTRL+Z" (Undo) its creation.</p>
  
  <p>How to make snapshot of current state of ckeditor before inserting its html, so CTRL+Z after that would be usable?</p>