title: ggplot font family change between versions
body: <p>In the following picture you can see the same part of a ggplot graph, created in two different (windows) machines. Above each graph I have written the versions of the related packages. I am not using any <code>font family</code> setting in the ggplot call. Why do I get different fonts with the most recent version? (The change reminds me of the effect that <code>Cleartype</code> setting has in smoothing font edges)</p>
  
  <p><img src="https://i.stack.imgur.com/U1BzT.png" alt="picture"></p>