title: QTextLayout manual line breaking
body: <p>I'm trying to render lines one by one using <code>QTextLayout</code>. I've tried to set <code>wrapMode</code> to <code>QTextOption::ManualWrap</code> and call <code>QTextLine::setNumColumns</code> for each line but the whole text appears in a single line.</p>
  
  <p>I've also tried to set <code>wrapMode</code> to <code>QTextOption::WrapAnywhere</code> and this time the text is broken into lines but the empty lines (the ones which consist only of <code>\n</code>) are not visible.</p>
  
  <p>I've tried to link against both <code>Qt4</code> and <code>Qt5</code> with no results.</p>
  
  <p>What am I doing wrong?</p>