markdown默认代码中增加pre防止空行被修改

web/admin/problem_add_page.php

@@ -15,7 +15,7 @@
   <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
   <title>Problem Add</title>
 </head>	  
-	  <?php
+	  <pre?php
   echo "<center><h3>".$MSG_PROBLEM."-".$MSG_ADD."</h3></center>";
   include_once("kindeditor.php") ;
   $source=pdo_query("select source from problem order by problem_id desc limit 1"); //默认续用最后一次的分类标签
@@ -43,8 +43,9 @@
         </p>
         <p align=left>
           <?php echo "<h4>".$MSG_Description."(<64kB)</h4>"?>
-	  <textarea class="kindeditor" rows=13 name=description cols=80><span class='md auto_select'>&nbsp;
-&nbsp;</span></textarea><br>
+	  <textarea class="kindeditor" rows=13 name=description cols=80><span class='md auto_select'><pre>
+    <br><br>
+    </pre></span></textarea><br>
         </p>
         <p align=left>
           <?php echo "<h4>".$MSG_Input."(<64kB)</h4>"?>