title: Account for scrollbar width in floating auto-sized ExtJS panel
body: <p>Here's my problem, using ExtJS 4.1.1: I've got a floating panel whose contents may change in size over time. I'd like to have the floating panel resize around the content, but cap the height to a maximum 400 pixels, after which point a vertical scrollbar should appear.</p>
  
  <p>This JSFiddle explains the problem best: <a href="http://jsfiddle.net/38Kaf/6/" rel="nofollow">http://jsfiddle.net/38Kaf/6/</a> .</p>
  
  <p>When the content size is below the maxHeight, the auto-sizing works beautifully. But when it's larger (350px or more), the panel width is too small to contain both the blue box <em>and</em> the vertical scrollbar, causing the horizontal scrolling to appear.</p>
  
  <p>Note that neither of the layout properties ('manageOverflow' and 'reserveScrollbar') have any effect.</p>
  
  <p>Any suggestions for workarounds or alternative approaches are welcome!</p>