title: Line break in ggplot annotate with LateX expression
body: <p>SITUATION:</p>
  
  <p>I have a ggplot diagram, where I want to add some text annotation. The text annotation should appear in two lines (for readibility and space), and each line includes some TeX formula:</p>
  
  <pre><code>library(tidyverse)
  library(latex2exp)
  
  ggplot(NULL, aes(c(-5,5))) +
        geom_area(stat = "function", fun = dnorm, fill = "grey40", xlim = c(-2, 2)) +
        annotate(geom = "text", label = TeX(paste("Distribution of $\\bar{x}$","\n","under $H_0$")),
                 x = -1, y = 0.3,
                 color = "red")
  </code></pre>
  
  <p>PROBLEM:</p>
  
  <p>The line break does <em>not</em> show up. The line is not split in two lines.</p>
  
  <p>WHAT DID NOT WORK:</p>
  
  <p>I have tried <code>paste(TeX(...))</code>, and <code>parse = T</code>, without success.</p>
  
  <p><a href="https://i.stack.imgur.com/cVWDr.png" rel="noreferrer"><img src="https://i.stack.imgur.com/cVWDr.png" alt="enter image description here"></a></p>
  
  <p>I also tried this <code>label = expression(paste("distribution of ", bar(x), "\n", "under H0"))</code> looked up <a href="https://stackoverflow.com/questions/18237134/line-break-in-expression">here</a>, no success.</p>
  
  <p>QUESTION:</p>
  
  <p>How can I split the annotation (red color text) in two lines?</p>