[Mono-winforms-list] Managed window patch

[Rolf Bjarne Kvinge]

>  * Translation between client and non-client coordinates is wrong.
> (There are actually two cases: buttons and borders on the managed
> window for non-maximized MDI children and buttons on the parent menu
> for maximized MDI children. This bug existed before I started making my
> changes. I did not fix it yet because it may involve changing other
> pieces of code that rely on the wrong coordinates and it doesn't affect
> rendering.)

Exactly what is the problem here? Client and non-client coordinates did have
a lot of problems in the past (it's a pain to implement it on X, since X
doesn't have that concept), though I thought most of them were fixed.

Rolf