Trackbar size fixes

[Duane Clark]

Duane Clark wrote:
> Duane Clark wrote:
> 
>>Hmm, attached is what that looks like for me. So I don't know why it 
>>looks bad to you.
> 
> 
> 
> Oops, sorry. I was using a native control there. I do see the same thing
> as you.

(Sorry about replying to myself several times)

As BiGgUn suggests, in TRACKBAR_InitializeThumb, setting:
     infoPtr->uThumbLen = 21;

fixes IE. I suspect that is close to correct, other than that it 
probably should not be a magic number.