title: Markers are not visible in seaborn plot
body: <p>Here is an example:</p>
  
  <pre><code>import seaborn as sns
  ax = sns.lineplot(range(10), range(10), markers=True)
  </code></pre>
  
  <p><a href="https://i.stack.imgur.com/ZAmM1.png" rel="noreferrer"><img src="https://i.stack.imgur.com/ZAmM1.png" alt="enter image description here"></a></p>
  
  <p>Why aren't there any markers although I set <code>markers=True</code>?</p>