Adding a test that uses tabs.

Added a test for trailing tabs and -%}
Refs #284

lib/Twig/Lexer.php

@@ -183,8 +183,10 @@ class Twig_Lexer implements Twig_LexerInterface
 
     protected function lexBlock()
     {
+        $trimTag = preg_quote($this->options['tag_trim_block'][1], '/');
         $endTag = preg_quote($this->options['tag_block'][1], '/');
-        if (empty($this->brackets) && preg_match('/\s*'. $endTag.'/A', $this->code, $match, null, $this->cursor)) {
+        
+        if (empty($this->brackets) && preg_match('/\s*'. $trimTag . '\h*|\s*' .$endTag.'/A', $this->code, $match, null, $this->cursor)) {
 
             $this->pushToken(Twig_Token::BLOCK_END_TYPE);
             $this->moveCursor($match[0]);

test/Twig/Tests/Fixtures/tags/trim_block.test

@@ -6,9 +6,19 @@ Whitespace trimming on tags.
         <li>{{ string }}</li>
     {%- endif %}
     </ul>
+
+	<ul>
+	{%- if trailing -%}	
+		<li>{{ trailing }}</li>
+	{%- endif -%}	
+	</ul>
 --DATA--
-return array('string' => 'a value')
+return array('string' => 'a value', 'trailing' => 'trailing tabs')
 --EXPECT--
     <ul>
         <li>a value</li>
     </ul>
+
+	<ul>
+		<li>trailing tabs</li>
+	</ul>