comctl32: fixed drawing the trackbar background when themes are installed

[Reece Dunn]

On 09/10/2007, Frank Richter <frank.richter at gmail.com> wrote:
> On 07.10.2007 17:41, Reece Dunn wrote:
> > The DPI trackbar has a black background that does not match the
> > property sheet background.
> >
> > This patch fixes this so that the trackbar is drawn correctly.
>
> Wouldn't, or so says my intuition, the parent background usually be
> drawn before the control background?

Indeed you are right.

Also, this should be done when IsThemeBackgroundPartiallyTransparent
returns true, to do it properly.

I'll clean up the code and resubmit.

- Reece