解析时多标题多出的空格

@@ -336,6 +336,9 @@ class Header{
 
         $str = trim($str);
         $str = explode("\r\n",$str);
+        foreach ($str as $k=>$s){
+            $str[$k] = ltrim($s,' ');
+        }
         $str = implode('',$str);
         preg_match_all("/=\?[a-z0-9-.]{3,}\?[bq]\?.*\?=/Ui",$str,$codes);
         foreach ($codes[0] as $c){
@@ -350,7 +353,7 @@ class Header{
                 $str = str_replace($c,$s,$str);
             }
         }
-        return str_replace("\n ",'',$str);
+        return $str;
     }