[Bug 27579] The appearance of uTorrent 3.x torrents list is broken

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=27579

--- Comment #41 from Lorenzo Ferrillo <lorenzofer at live.it> ---
More info from wxWisget source.

When the comctl32.dll version is > 6 the listctrl component is assigned style
LVS_EX_DOUBLEBUFFER
and wxWidget make this call:
        // When using LVS_EX_DOUBLEBUFFER, we don't need to erase our
        // background and doing it only results in flicker.
        SetBackgroundStyle(wxBG_STYLE_PAINT);


wxWidget also install it's own wndproc that handle messages, and forward to the
builting procedure if a message is not handled. (it return false form the
internal message processing routine)

Now wxWidget as specific handling of WM_ERASEBKGND, then when the background
style is wxBG_STYLE_PAINT or wxBG_STYLE_TRANSPARENT it return True and doesn't
erase the background

It probably expect it to  be fully repainted in WM_PAINT

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