title: How can I stop a horizontal rule from indenting in rmarkdown LaTeX Tufte handout?
body: <p>I have an rmarkdown PDF Tufte handout with a horizontal rule on one line, where someone is supposed to sign the document. I would like the rule to be left justified with no indent, but <code>\noindent</code> isn't working. Reading about <code>\noindent</code> led me to believe that maybe it was being ignored because the line wasn't recognized as being a new line, but adding a paragraph break doesn't seem to work either.</p>
  <p>My current thinking is that the horizontal rule might not be recognized as real text, so LaTeX just sees an empty line and ignores the <code>\noindent</code>, and I seem to remember that there's some non-printing character I could stick in there that would get it to be recognized, but I don't know what that is or how to search for it.</p>
  <p>This same document was working for me recently, but broke when I updated R. And it's only a problem with the Tufte handout. In a normal LaTeX PDF document the <code>\noindent</code> works fine.</p>
  <pre><code>---
  output:
    tufte::tufte_handout: default
    tufte::tufte_pdf: default
  ---
  
  Here's where someone should sign, but rules are indented:
  
  \vspace{22pt}  
  
  \noindent\rule{7.3cm}{0.4pt}\hspace{.3cm}\rule{3cm}{0.4pt}  
  
  \noindent Signer\hspace{6.7cm}Date  
  
  \vspace{30pt}  
  
  Still doesn't work with paragraph break:
  
  \vspace{22pt}  
  
  \par\noindent\rule{7.3cm}{0.4pt}\hspace{.3cm}\rule{3cm}{0.4pt}  
  
  \noindent Signer\hspace{6cm}Date 
  
  \vspace{30pt}
  
  I can indent the text to match, but I don't like the look:
  
  \vspace{22pt}  
  
  \rule{7.3cm}{0.4pt}\hspace{.3cm}\rule{3cm}{0.4pt}  
  
  \indent Signer\hspace{6.7cm}Date  
  
  \vspace{30pt} 
  </code></pre>
  <p>Thanks in advance for any ideas.</p>