title: git Ignoring only some changes in a file
body: <p>In fact I would like to know if it's possible to ignore a change once, but not the others..</p>
  
  <p>For example I have a file "file1", first I write some change into the file, for example I add "hello" to the last line.
  Then I want someting to ignore this changement in a git status, but keeping the "hello" line to the file, and for each other change I want to see in " git status " that the file is changed.</p>
  
  <p>So <code>--skip-worktree</code> for example don't work, because it ignore my changes and keep the new lines, but it also ignore my futures change into the file..</p>
  
  <p>Is it possible to do that ?</p>