title: Microsoft Azure DevOps Repo: search for text/code in specific branch
body: <p>I'm embarrassed to ask what <em>should</em> be a simple thing to figure out....</p>
  <p>However, when I'm viewing a specific branch in an Azure DevOps repository online (e.g., when reviewing a PR), I can't figure out how to perform a search of that branch's code.</p>
  <p>I see a global search textbox at the top, as follows:
  <a href="https://i.stack.imgur.com/iwMdP.png" rel="noreferrer"><img src="https://i.stack.imgur.com/iwMdP.png" alt="enter image description here" /></a></p>
  <p>And I see a textbox for searching the branch for file/folder <em>names</em>, as follows:</p>
  <p><a href="https://i.stack.imgur.com/ud4fc.png" rel="noreferrer"><img src="https://i.stack.imgur.com/ud4fc.png" alt="enter image description here" /></a></p>
  <p>But what I <em>don't</em> see is a textbox for searching the <em>contents</em> of the files in that branch....e.g. for finding occurrences of <code>someFunction()</code> or <code>somePropertyName</code> or whatever inside the code files for that particular branch.</p>
  <p>Did Microsoft really omit this functionality?  Or am I missing something?  How do we perform such a search?</p>