[Bug 58800] tlReader 10.1.0.2004 toolbar has broken rendering

[WineHQ Bugzilla]

http://bugs.winehq.org/show_bug.cgi?id=58800

--- Comment #7 from Zhiyi Zhang <zzhang(a)codeweavers.com> ---
Created attachment 79667
  --> http://bugs.winehq.org/attachment.cgi?id=79667
PoC patch

This bug occurs because wxWidgets expects a WM_ERASEBKGND message when handling
the WM_PAINT message. See
https://github.com/wxWidgets/wxWidgets/blob/master/src/msw/toolbar.cpp#L2248.
The attached PoC patch fixes it. I will add tests and send a proper fix soon.

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