title: How to commit only a part of the changes made to a file?
body: <p>I want to commit separately different parts of the same file. </p>
  
  <p>I want to commit line 2 first with the message (changeset 1) and the 4th line with the message (changeset 2). How do I do it?</p>
  
  <p>I am using Mercurial Distributed SCM (version 3.5.2+20151001)</p>