Ticket #3764: 3764.patch

_source/plugins/showblocks/plugin.js

@@ -99 +99 @@
                 refresh : function( editor )
                 {
                         var funcName = ( this.state == CKEDITOR.TRISTATE_ON ) ? 'addClass' : 'removeClass';
-                        editor.document.getBody()[funcName]( 'cke_show_blocks' );
+                        editor.document.getBody()[ funcName ]( 'cke_show_blocks' );
                 }
         };
 
@@ -131 +131 @@
                                         if ( command.state != CKEDITOR.TRISTATE_DISABLED )
                                                 command.refresh( editor );
                                 });
+                        
+                        // Refresh the command on setData.
+                        editor.on( 'contentDom', function() {
+                                if ( command.state != CKEDITOR.TRISTATE_DISABLED )
+                                                command.refresh( editor );
+                        });
                 }
         });
 } )();