Fix Treeview collapsing

[Maxime Bellengé]

Alexandre, discard this patch please, it has been fixed with this patch
from Dmitry for scrolling on 17th december:
http://source.winehq.org/git/?p=wine.git;a=commit;h=8d9fb6331e86c8ecea4ca16e12a1121c4cb6559a

Maxime

On Sat, 2005-12-17 at 15:58 +0100, Maxime Bellengé wrote:
> For a while now, I see very often garbage displayed in treeviews when I
> collapse them. For instance in eMule (in statistics tab) or MTKReMaker
> (http://personal.inet.fi/cool/mediatek/programs/mtkremaker.html).
> 
> The problem was in the scrolling rectangle defined. This patch fixes it.
> 
> Maxime
> 
> Changelog:
>    * Correctly defines the rectangle to scroll when collapsing a node.
> 
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