Keydown listener doesn't catch enter key

[Jakub Ś]

1. Paste in below code in replacebycode sample

   var editor = CKEDITOR.replace( 'editor1', {
   
   } );
   			
   editor.on( 'pluginsLoaded', function( evt ) {
   		editor.on( 'contentDom', function( e ) {
   			var editable = editor.editable();		
   			var doc = editor.document;
   			editable.attachListener( doc, 'keydown', function( event ){		
   				console.log(event);
   			});
   		});
   	});				
   

2. Run sample and Press Enter
3. keydown listener doesn't catch it.

Problem can be reproduced in all browsers from CKEditor 4 beta