Index: /CKEditor/trunk/CHANGES.html
===================================================================
--- /CKEditor/trunk/CHANGES.html	(revision 4818)
+++ /CKEditor/trunk/CHANGES.html	(revision 4819)
@@ -71,4 +71,5 @@
 		<li><a href="http://dev.fckeditor.net/ticket/4882">#4882</a> : Fixed unexpected margin style left behind on content cleaning up from MS-Word.</li>
 		<li><a href="http://dev.fckeditor.net/ticket/4896">#4896</a> : Fixed paste nested list from MS-Word with measurement units set to cm is broken.</li>
+		<li><a href="http://dev.fckeditor.net/ticket/4899">#4899</a> : Fixed unable to undo pre-formatted style.</li>
 	</ul>
 	<h3>
Index: /CKEditor/trunk/_source/plugins/format/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/format/plugin.js	(revision 4818)
+++ /CKEditor/trunk/_source/plugins/format/plugin.js	(revision 4819)
@@ -58,5 +58,9 @@
 					styles[ value ].apply( editor.document );
 
-					editor.fire( 'saveSnapshot' );
+					// Save the undo snapshot after all changes are affected. (#4899)
+					setTimeout( function()
+					{
+						editor.fire( 'saveSnapshot' );
+					}, 0 );
 				},