title: Zoom in on single facet
body: <p><strong>EDIT</strong>: 
  I've read through this <a href="https://stackoverflow.com/questions/12207419/r-how-do-i-use-coord-cartesian-on-facet-grid-with-free-ranging-axis">question</a> but that does not(in my opinion) readily solve the problem. Also considering, it's a bit old; perhaps someone has come up with a hack that does not need one to do more "hacking".</p>
  
  <p>Given some dummy data below:</p>
  
  <pre><code>dummy_df&lt;-data.frame(A=runif(50,0,5),B=runif(50,5,90),Group=c(1,2))
  dummy_df %&gt;% 
    ggplot(aes(A,B))+geom_point()+
    facet_grid(.~Group)+
    coord_cartesian(xlim=c(1,3))
  </code></pre>
  
  <p>Current plot:
  <a href="https://i.stack.imgur.com/vK2Mo.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/vK2Mo.png" alt="enter image description here"></a></p>
  
  <p>How could one apply the last call to only a single facet say only facet 1 of this plot?! I would name it something like <code>zoom_at(facet_1)</code>.
  Thanks in advance.</p>