title: Open new tab in existing meld instance via a command line
body: <p>Is there a way to start new file comparison in an existing meld instance with a command line (like terminal) or programmatically.</p>
  
  <hr>
  
  <p>For example, following two commands start two instances of <code>meld</code></p>
  
  <pre><code>$ meld ./1/a1.txt ./2/a2.txt &amp;
  $ meld ./3/a3.txt ./4/b4.txt &amp;
  </code></pre>
  
  <p>However, I'd prefer both file comparisons were opened in same instance in different tabs. I don't know the way to obtain it, but I can illustrate what I mean.</p>
  
  <p>I assume that it possible to modify second command (<code>meld ./3/a3.txt ./4/b4.txt &amp;</code>). For example it can help some unknown option,</p>
  
  <pre><code>$ meld --some-option-to-open-in-tab ./3/a3.txt ./4/b4.txt &amp;
  </code></pre>
  
  <p>or maybe it's possible to write some application that added a file comparison to existing instance of <code>meld</code></p>
  
  <pre><code>$ MyMeld ./3/a3.txt ./4/b4.txt &amp;
  </code></pre>