backed out 648b42a75739, which was a NON-trivial whitespace commit.  It broke the Typography class's string replacements, for instance
diff --git a/system/database/drivers/mysql/mysql_driver.php b/system/database/drivers/mysql/mysql_driver.php
index dec1586..b7d547c 100644
--- a/system/database/drivers/mysql/mysql_driver.php
+++ b/system/database/drivers/mysql/mysql_driver.php
@@ -1,4 +1,4 @@
-<?php if ( ! defined('BASEPATH')) exit('No direct script access allowed');
+<?php  if ( ! defined('BASEPATH')) exit('No direct script access allowed');
 /**
  * CodeIgniter
  *
@@ -133,7 +133,7 @@
 	function db_set_charset($charset, $collation)
 	{
 		static $use_set_names;
-
+		
 		if ( ! isset($use_set_names))
 		{
 			// mysql_set_charset() requires PHP >= 5.2.3 and MySQL >= 5.0.7, use SET NAMES as fallback
@@ -302,12 +302,12 @@
 		if (is_array($str))
 		{
 			foreach ($str as $key => $val)
-	  		{
+	   		{
 				$str[$key] = $this->escape_str($val, $like);
-	  		}
+	   		}
 
-	  		return $str;
-	  	}
+	   		return $str;
+	   	}
 
 		if (function_exists('mysql_real_escape_string') AND is_resource($this->conn_id))
 		{
@@ -650,7 +650,7 @@
 			{
 				if ($field != $index)
 				{
-					$final[$field][] = 'WHEN '.$index.' = '.$val[$index].' THEN '.$val[$field];
+					$final[$field][] =  'WHEN '.$index.' = '.$val[$index].' THEN '.$val[$field];
 				}
 			}
 		}