Ticket #6226: 6226_2.patch

_source/plugins/styles/plugin.js

@@ -808 +808 @@
                         // Merge previous <pre> blocks.
                         mergePre( newBlock );
                 }
+                
+                block.copyAttributes( newBlock );
         }
 
         var nonWhitespaces = CKEDITOR.dom.walker.whitespaces( true );