title: TextBox horizontal-scroll bug
body: <p>There appears to be a bug in the Win32 edit control that WinForms.TextBox wraps:</p>
  
  <ol>
  <li>Open Notepad.</li>
  <li>Make sure that the bottom scrollbar is visible (you may have to turn off word wrapping).</li>
  <li>Enter a long line, so that the bottom scrollbar activates.</li>
  <li>Delete some of this text, so that the line becomes much smaller.</li>
  </ol>
  
  <p>Now the bottom scrollbar doesn't update to reflect the fact that the line is now much smaller.</p>
  
  <p>In fact, even if you resize the window, the scrollbar still seems to think that we have a huge line.  The only work-around seems to be enabling and disabling word wrapping.</p>
  
  <p>Can anyone suggest a way to fix this from a WinForms .NET app?</p>