prevent double convert of attributes

Author: blaaat

src/PHPHtmlParser/Dom/AbstractNode.php

@@ -70,8 +70,8 @@ public function __construct()
     public function __get($key)
     {
         // check attribute first
-        if ( ! is_null($this->getAttribute($key))) {
-            return $this->getAttribute($key);
+        if ( ! is_null($value = $this->getAttribute($key))) {
+            return $value;
         }
         switch (strtolower($key)) {
             case 'outerhtml':

src/PHPHtmlParser/Dom/Tag.php

@@ -146,6 +146,7 @@ public function setAttribute($key, $value)
             $value = [
                 'value'       => $value,
                 'doubleQuote' => true,
+                'didConvertCharset' => true, 
             ];
         }
         $this->attr[$key] = $value;
@@ -217,9 +218,10 @@ public function getAttribute($key)
             return null;
         }
         $value = $this->attr[$key]['value'];
-        if (is_string($value) && ! is_null($this->encode)) {
+        if (is_string($value) && ! is_null($this->encode) && ! ($this->attr[$key]['didConvertCharset'] ?? false)) {
             // convert charset
             $this->attr[$key]['value'] = $this->encode->convert($value);
+            $this->attr[$key]['didConvertCharset'] = true;
         }
 
         return $this->attr[$key];