Index: /CKEditor/trunk/CHANGES.html
===================================================================
--- /CKEditor/trunk/CHANGES.html	(revision 5638)
+++ /CKEditor/trunk/CHANGES.html	(revision 5639)
@@ -48,4 +48,5 @@
 		<li><a href="http://dev.fckeditor.net/ticket/5411">#5411</a> : anchor, hidden, page-break objects (images) can't no longer be resized.</li>
 		<li><a href="http://dev.fckeditor.net/ticket/5456">#5456</a> : Initial focus incorect in api_dialog sample page.</li>
+		<li><a href="http://dev.fckeditor.net/ticket/5628">#5628</a> : Incorrect &lt;pre&gt; siblings merging.</li>
 	</ul>
 	<h3>
Index: /CKEditor/trunk/_source/plugins/styles/plugin.js
===================================================================
--- /CKEditor/trunk/_source/plugins/styles/plugin.js	(revision 5638)
+++ /CKEditor/trunk/_source/plugins/styles/plugin.js	(revision 5639)
@@ -775,4 +775,5 @@
 	}
 
+	var nonWhitespaces = CKEDITOR.dom.walker.whitespaces( true );
 	/**
 	 * Merge a <pre> block with a previous sibling if available.
@@ -781,5 +782,5 @@
 	{
 		var previousBlock;
-		if ( !( ( previousBlock = preBlock.getPreviousSourceNode( true, CKEDITOR.NODE_ELEMENT ) )
+		if ( !( ( previousBlock = preBlock.getPrevious( nonWhitespaces ) )
 				 && previousBlock.is
 				 && previousBlock.is( 'pre') ) )