Fix Treeview collapsing

[Maxime Bellengé]

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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