title: Decrease line spacing in a TextBlock / FlowDocument
body: <p>Some fonts have a large amount of whitespace above and below the characters. Is there a way to correct for that, and tighten up the space between lines of a word-wrapped paragraph in WPF (in either a TextBlock or a FlowDocument)? Kind of like a negative margin between lines?</p>
  
  <p>There's a <code>LineHeight</code> property on <code>Paragraph</code> and <code>TextBlock</code>, but it only seems to let you <em>increase</em> the spacing -- if you set it to a smaller value than the default, it's simply ignored.</p>