Index: src/wp-admin/js/editor-expand.js
===================================================================
--- src/wp-admin/js/editor-expand.js	(revision 32321)
+++ src/wp-admin/js/editor-expand.js	(working copy)
@@ -15,7 +15,6 @@
 			$visualEditor = $(),
 			$textTop = $( '#ed_toolbar' ),
 			$textEditor = $( '#content' ),
-			$textEditorClone = $( '<div id="content-textarea-clone"></div>' ),
 			$bottom = $( '#post-status-info' ),
 			$menuBar = $(),
 			$statusBar = $(),
@@ -52,16 +51,6 @@
 				sideSortablesHeight: 0
 			};
 
-		$textEditorClone.insertAfter( $textEditor );
-
-		$textEditorClone.css( {
-			'font-family': $textEditor.css( 'font-family' ),
-			'font-size': $textEditor.css( 'font-size' ),
-			'line-height': $textEditor.css( 'line-height' ),
-			'white-space': 'pre-wrap',
-			'word-wrap': 'break-word'
-		} );
-
 		function getHeights() {
 			var windowWidth = $window.width();
 
@@ -85,6 +74,8 @@
 		}
 
 		function textEditorKeyup( event ) {
+			return;
+
 			var VK = jQuery.ui.keyCode,
 				key = event.keyCode,
 				range = document.createRange(),
@@ -123,29 +114,25 @@
 		}
 
 		function textEditorResize() {
+			var pageYOffset, textEditor, height;
+
 			if ( ( mceEditor && ! mceEditor.isHidden() ) || ( ! mceEditor && initialMode === 'tinymce' ) ) {
 				return;
 			}
 
-			var textEditorHeight = $textEditor.height(),
-				hiddenHeight;
+			pageYOffset = window.pageYOffset
 
-			$textEditorClone.width( $textEditor.width() - 22 );
-			$textEditorClone.text( $textEditor.val() + '&nbsp;' );
+			textEditor = $textEditor[0];
+			height = textEditor.style.height;
 
-			hiddenHeight = $textEditorClone.height();
+			textEditor.style.height = 'auto';
+			textEditor.style.height = textEditor.scrollHeight + 'px';
 
-			if ( hiddenHeight < autoresizeMinHeight ) {
-				hiddenHeight = autoresizeMinHeight;
-			}
+			window.scrollTo( window.pageXOffset, pageYOffset );
 
-			if ( hiddenHeight === textEditorHeight ) {
-				return;
+			if ( height !== textEditor.style.height ) {
+				adjust();
 			}
-
-			$textEditor.height( hiddenHeight );
-
-			adjust();
 		}
 
 		// We need to wait for TinyMCE to initialize.
@@ -603,8 +590,6 @@
 					$textEditor.css( {
 						marginTop: heights.textTopHeight
 					} );
-
-					$textEditorClone.width( contentWrapWidth - 20 - ( borderWidth * 2 ) );
 				}
 			}
 		}