message: Fix smooth drag scrolling bug
  Multiply before dividing to avoid rounding problems.
diff: @@ -219,7 +219,7 @@ void Slider::onMouseMove(int x, int y, int /*dX*/, int /*dY*/)
  return;
  }
  - value(mMax * ((y - mSlideBar.y) / mSlideBar.height));
  + value(mMax * (y - mSlideBar.y) / mSlideBar.height);
  }
  else
  {
  