Index: CKEditor/trunk/_source/plugins/htmlwriter/plugin.js
===================================================================
--- CKEditor/trunk/_source/plugins/htmlwriter/plugin.js	(revision 3172)
+++ CKEditor/trunk/_source/plugins/htmlwriter/plugin.js	(revision 3676)
@@ -79,9 +79,13 @@
 				});
 		}
-
 		this.setRules( 'br',
 			{
 				breakAfterOpen : true
 			});
+		// Disable indentation on <pre>.
+		this.setRules( 'pre',
+		{
+		  indent: false
+		} );
 	},