Index: includes/form.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/form.inc,v
retrieving revision 1.438
diff -u -p -F '^f' -r1.438 form.inc
--- includes/form.inc	7 Mar 2010 23:14:20 -0000	1.438
+++ includes/form.inc	8 Mar 2010 09:17:01 -0000
@@ -2801,16 +2801,24 @@ function theme_form($variables) {
  */
 function theme_textarea($variables) {
   $element = $variables['element'];
+  $wrapper_attributes = array(
+    'class' => array('form-textarea-wrapper'),
+  );
   $class = array('form-textarea');
 
-  // Add resizable behavior
-  if ($element['#resizable'] !== FALSE) {
+  // Add resizable behavior.
+  if (!empty($element['#resizable'])) {
     drupal_add_js('misc/textarea.js');
-    $class[] = 'resizable';
+    $wrapper_attributes['class'][] = 'resizable';
   }
 
+  $output = '<div' . drupal_attributes($wrapper_attributes) . '>';
+
   _form_set_class($element, $class);
-  return '<textarea cols="' . $element['#cols'] . '" rows="' . $element['#rows'] . '" name="' . $element['#name'] . '" id="' . $element['#id'] . '" ' . drupal_attributes($element['#attributes']) . '>' . check_plain($element['#value']) . '</textarea>';
+  $output .= '<textarea cols="' . $element['#cols'] . '" rows="' . $element['#rows'] . '" name="' . $element['#name'] . '" id="' . $element['#id'] . '" ' . drupal_attributes($element['#attributes']) . '>' . check_plain($element['#value']) . '</textarea>';
+
+  $output .= '</div>';
+  return $output;
 }
 
 /**
Index: misc/textarea.js
===================================================================
RCS file: /cvs/drupal/drupal/misc/textarea.js,v
retrieving revision 1.30
diff -u -p -F '^f' -r1.30 textarea.js
--- misc/textarea.js	31 Aug 2009 05:51:08 -0000	1.30
+++ misc/textarea.js	8 Mar 2010 09:17:02 -0000
@@ -3,16 +3,14 @@
 
 Drupal.behaviors.textarea = {
   attach: function (context, settings) {
-    $('textarea.resizable', context).once('textarea', function () {
+    $('.form-textarea-wrapper.resizable', context).once('textarea', function () {
       // When wrapping the text area, work around an IE margin bug. See:
       // http://jaspan.com/ie-inherited-margin-bug-form-elements-and-haslayout
       var staticOffset = null;
-      var textarea = $(this).wrap('<div class="resizable-textarea"><span></span></div>');
+      var textarea = $(this).addClass('resizable-textarea').find('textarea').wrap('<span></span>');
       var grippie = $('<div class="grippie"></div>').mousedown(startDrag);
 
-      grippie
-        .insertAfter(textarea)
-        .css('margin-right', grippie.width() - textarea.width());
+      grippie.insertAfter(textarea);
 
       function startDrag(e) {
         staticOffset = textarea.height() - e.pageY;
Index: modules/filter/filter.css
===================================================================
RCS file: /cvs/drupal/drupal/modules/filter/filter.css,v
retrieving revision 1.3
diff -u -p -F '^f' -r1.3 filter.css
--- modules/filter/filter.css	7 Mar 2010 23:14:20 -0000	1.3
+++ modules/filter/filter.css	8 Mar 2010 09:17:03 -0000
@@ -5,7 +5,6 @@
 }
 .filter-wrapper {
   border-top: 0;
-  width: 95%;
   margin: 0;
   padding: 1.5em 0 1.5em;
 }
Index: modules/node/node.css
===================================================================
RCS file: /cvs/drupal/drupal/modules/node/node.css,v
retrieving revision 1.13
diff -u -p -F '^f' -r1.13 node.css
--- modules/node/node.css	17 Feb 2010 03:37:12 -0000	1.13
+++ modules/node/node.css	8 Mar 2010 09:17:03 -0000
@@ -31,10 +31,6 @@ td.revision-current {
 .node-form .standard {
   clear: both;
 }
-.node-form textarea {
-  display: block;
-  width: 95%;
-}
 .node-form .attachments fieldset {
   float: none;
   display: block;
Index: modules/system/system-behavior.css
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system-behavior.css,v
retrieving revision 1.5
diff -u -p -F '^f' -r1.5 system-behavior.css
--- modules/system/system-behavior.css	3 Mar 2010 19:46:26 -0000	1.5
+++ modules/system/system-behavior.css	8 Mar 2010 09:17:04 -0000
@@ -79,8 +79,13 @@ html.js fieldset.collapsible .fieldset-w
 /**
  * Resizable textareas
  */
-.resizable-textarea {
-  width: 95%;
+.form-textarea-wrapper textarea {
+  margin: 0;
+  width: 100%;
+  display: block;
+  -webkit-box-sizing: border-box;
+  -moz-box-sizing: border-box;
+  box-sizing: border-box;
 }
 .resizable-textarea .grippie {
   height: 9px;
@@ -90,11 +95,6 @@ html.js fieldset.collapsible .fieldset-w
   border-top-width: 0;
   cursor: s-resize;
 }
-html.js .resizable-textarea textarea {
-  margin-bottom: 0;
-  width: 100%;
-  display: block;
-}
 
 /**
  * Table drag and drop
Index: themes/seven/style.css
===================================================================
RCS file: /cvs/drupal/drupal/themes/seven/style.css,v
retrieving revision 1.47
diff -u -p -F '^f' -r1.47 style.css
--- themes/seven/style.css	5 Mar 2010 15:23:25 -0000	1.47
+++ themes/seven/style.css	8 Mar 2010 09:17:05 -0000
@@ -607,7 +607,6 @@ div.teaser-checkbox .form-item,
 /* Filter */
 .filter-wrapper {
   border-top: 0;
-  width: 95%;
   padding: 10px 2px;
 }
 .filter-wrapper > div {
@@ -692,10 +691,6 @@ select.form-select:focus {
   color: #000;
   border-color: #ace;
 }
-.resizable-textarea .grippie {
-  width: 100%;
-  padding: 0 2px;
-}
 html.js input.form-autocomplete {
   background-position: 100% 4px;
 }