title: C++ {fmt} format dynamically repeat argument
body: <p>I need to match a file format that heavily relies on tab-based indentation.
  Is there an idiomatic way to repeatedly insert a character (in my case <code>\t</code>) a given <code>n</code> number of times using {fmt}?</p>
  
  <p>I'm looking for something similar to how the alignment works:</p>
  
  <pre class="lang-cpp prettyprint-override"><code>fmt::format("{:&gt;{}}", "right aligned", 30);
  // Result: "                 right aligned"
  </code></pre>
  
  <p>All the solutions I came up with feel contrived.</p>