Fixes drawing of previews

fix-drawing.diff

=== modified file 'dash/DashView.cpp'
--- dash/DashView.cpp	2012-08-16 14:38:33 +0000
+++ dash/DashView.cpp	2012-08-16 22:12:13 +0000
@@ -381,13 +381,6 @@
 void DashView::Draw(nux::GraphicsEngine& gfx_context, bool force_draw)
 {
   renderer_.DrawFull(gfx_context, content_geo_, GetAbsoluteGeometry(), GetGeometry());
-  
-  // we only do this because the previews don't redraw correctly right now, so we have to force
-  // a full redraw every frame. performance sucks but we'll fix it post FF
-  if (preview_displaying_)
-  {
-    preview_container_->ProcessDraw(gfx_context, true); 
-  }
 }
 
 void DashView::DrawContent(nux::GraphicsEngine& gfx_context, bool force_draw)
@@ -400,7 +393,7 @@
   if (preview_displaying_)
   {
    // disabled until the draw cycle in previews can be improved
-   preview_container_->ProcessDraw(gfx_context, force_draw);
+   preview_container_->ProcessDraw(gfx_context, IsFullRedraw());
   }
   else
   {