title: Use of pattern for template suggestion doesn't work in hook_theme()
body: <p>I'm trying to implement pattern and template suggestion but It doesn't work.<br>
  Here is the implementation of  <code>hook_theme()</code> with my pattern:</p>
  
  <pre><code>$theme['nm_home_page_zone'] = array(
    'pattern' =&gt; 'nm_home_page_zone__',
    'arguments' =&gt; array('nodes_content' =&gt; array(), 'nodes' =&gt; array()),
    'template' =&gt; 'zone-contenu',
  ),
  </code></pre>
  
  <p>And I call <code>theme()</code> with the following code:</p>
  
  <pre><code>$output .= theme(array('nm_home_page_zone__'.$rowZone-&gt;model.'_'.$rowZone-&gt;weight, 'nm_home_page_zone__'.$rowZone-&gt;model, 'nm_home_page_zone'), array(), array());
  </code></pre>
  
  <p>I got 2 template files (zone-contenu.tpl.php and zone-contenu--one.tpl.php) in my theme and my module (just to be sure).<br>
  The pattern and template suggestion should use zone-contenu--one.tpl.php in my case, but it doesn't work.  </p>
  
  <p>What I'm missing here?</p>