Index: /CKEditor/trunk/CHANGES.html
===================================================================
--- /CKEditor/trunk/CHANGES.html	(revision 7454)
+++ /CKEditor/trunk/CHANGES.html	(revision 7455)
@@ -100,4 +100,5 @@
 		<li><a href="http://dev.ckeditor.com/ticket/8528">#8528</a> : Redundant <code>imagePreviewBoxId</code> in the Image Properties dialog window is now removed.</li>
 		<li><a href="http://dev.ckeditor.com/ticket/8864">#8864</a> : [IE]Fix ARIA presentation of toolbar rich combo in JAWS.</li>
+		<li><a href="http://dev.ckeditor.com/ticket/8459">#8459</a> : Fix wrong undo step on enter key.</li>
 		<li>Updated the following language files as submitted to the <a href="https://www.transifex.net/projects/p/ckeditor/">CKEditor UI Translation Center</a>: Arabic, Bulgarian, Chinese, Croatian, Czech, Danish, Dutch, Esperanto, Estonian, Faroese, French, German, Greek, Gujarati, Hindi, Italian, Macedonian, Norwegian (Bokmål and Nynorsk), Polish, Portuguese, Turkish, Uighur, Ukrainian, Vietnamese, Welsh.</li>
 	</ul>
Index: /CKEditor/trunk/_source/plugins/undo/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/undo/plugin.js	(revision 7454)
+++ /CKEditor/trunk/_source/plugins/undo/plugin.js	(revision 7455)
@@ -261,5 +261,6 @@
 			if ( startedTyping || modifierSnapshot )
 			{
-				var beforeTypeImage = new Image( this.editor );
+				var beforeTypeImage = new Image( this.editor ),
+					beforeTypeCount = this.snapshots.length;
 
 				// Use setTimeout, so we give the necessary time to the
@@ -273,5 +274,8 @@
 							currentSnapshot = currentSnapshot.replace( /\s+data-cke-expando=".*?"/g, '' );
 
-						if ( beforeTypeImage.contents != currentSnapshot )
+						// If changes have taken place, while not been captured yet (#8459),
+						// compensate the snapshot.
+						if ( beforeTypeImage.contents != currentSnapshot &&
+							 beforeTypeCount == this.snapshots.length )
 						{
 							// It's safe to now indicate typing state.