Do not convert, if charsets are same.

ChangeLog

@@ -11,6 +11,8 @@ $Source$
 
 2004-06-07 Michal Čihař  <michal@cihar.com>
     * lang/czech: Updated.
+    * libraries/charset_conversion.lib.php: Do not convert, if charsets are
+      same.
 
 2004-06-07 Alexander M. Turek  <me@derrabus.de>
     * css/phpmyadmin.css.php: beautifications.

libraries/charset_conversion.lib.php

@@ -240,6 +240,7 @@ function PMA_convert_charset($what) {
  * @author  nijel
  */
 function PMA_convert_string($src_charset, $dest_charset, $what) {
+    if ($src_charset == $dest_charset) return $what;
     switch ($GLOBALS['PMA_recoding_engine']) {
         case PMA_CHARSET_RECODE:
             return recode_string($src_charset . '..'  . $dest_charset, $what);