Environment- test2, beta, Production
Browser- Chrome 39
1> Insert a comment.Click on "Insert" button to close the dialog.
2> While the comment is still highlighted, select any option from the Heading format list.For ex- select Block quote
3> Click to undo(keeping the comment highlighted).Notice the icon and the comment pop-up get detached. Also, JS error "Uncaught TypeError: Cannot read property 'getSurface' of null" shows up in console.