[PATCH] comctl32/toolbar: Correctly draw disabled toolbar button which contains 32 bpp bitmap with alpha channel.

[Nikolay Sivov]

I think it might be possible to replace some of the logic in toolbar 
with correct DrawIndirect() arguments, potentially fixing or extending 
Imagelist() implementation. For example, does it need to check 
'has_alpha' on every draw or could imagelist do that once, until bitmap 
is replaced.