title: How to make item view render rich (html) text in Qt
body: <p>Suppose my model has items with the following string for Qt::DisplayRole</p>
  
  <pre><code>&lt;span&gt;blah-blah &lt;b&gt;some text&lt;/b&gt; other blah&lt;/span&gt;
  </code></pre>
  
  <p>I want QTreeView (actually, any item view) to render it like a rich text. Instead, item views render it like a pure text by default. How to achieve the desired rendering?</p>
  
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  <p>Actually, this is a search results model. User enters a text, some document is searched against that text and the user is presented with search results, where the words being searched should be bolder than surrounding text.</p>