Index: /CKEditor/trunk/CHANGES.html
===================================================================
--- /CKEditor/trunk/CHANGES.html	(revision 6075)
+++ /CKEditor/trunk/CHANGES.html	(revision 6076)
@@ -51,4 +51,5 @@
 		<li><a href="http://dev.ckeditor.com/ticket/6656">#6656</a> : Panelbutton's buttons became active when clicking on source.</li>
 		<li><a href="http://dev.ckeditor.com/ticket/5404">#5404</a> : Whitespaces (NBSP) were incorrectly added into empty table cells and list items.</li>
+		<li><a href="http://dev.ckeditor.com/ticket/6419">#6419</a> : IE: List creation by merging problem.</li>
 	</ul>
 	<h3>
Index: /CKEditor/trunk/_source/core/dom/domobject.js
===================================================================
--- /CKEditor/trunk/_source/core/dom/domobject.js	(revision 6075)
+++ /CKEditor/trunk/_source/core/dom/domobject.js	(revision 6076)
@@ -168,4 +168,7 @@
 	 * Sets a data slot value for this object. These values are shared by all
 	 * instances pointing to that same DOM object.
+	 * <strong>Note:</strong> The created data slot is only guarantied to be available on this unique dom node,
+	 * thus any wish to continue access it from other element clones (either created by clone node or from innerHtml)
+	 * will fail, for such usage, please use {@link CKEDITOR.dom.element::setAttribute} instead.
 	 * @name CKEDITOR.dom.domObject.prototype.setCustomData
 	 * @function
Index: /CKEditor/trunk/_source/core/dom/node.js
===================================================================
--- /CKEditor/trunk/_source/core/dom/node.js	(revision 6075)
+++ /CKEditor/trunk/_source/core/dom/node.js	(revision 6076)
@@ -108,22 +108,23 @@
 			var $clone = this.$.cloneNode( includeChildren );
 
-			if ( !cloneId )
-			{
-				var removeIds = function( node )
-				{
-					if ( node.nodeType != CKEDITOR.NODE_ELEMENT )
-						return;
-
-					node.removeAttribute( 'id', false ) ;
-					node.removeAttribute( '_cke_expando', false ) ;
-
+			var removeIds = function( node )
+			{
+				if ( node.nodeType != CKEDITOR.NODE_ELEMENT )
+					return;
+
+				if ( !cloneId )
+					node.removeAttribute( 'id', false );
+				node.removeAttribute( '_cke_expando', false );
+
+				if ( includeChildren )
+				{
 					var childs = node.childNodes;
-					for ( var i=0 ; i < childs.length ; i++ )
+					for ( var i=0; i < childs.length; i++ )
 						removeIds( childs[ i ] );
-				};
-
-				// The "id" attribute should never be cloned to avoid duplication.
-				removeIds( $clone );
-			}
+				}
+			};
+
+			// The "id" attribute should never be cloned to avoid duplication.
+			removeIds( $clone );
 
 			return new CKEDITOR.dom.node( $clone );