First of all I showed the need of the modification.
https://sourceforge.net/tracker/index.php?func=detail&aid=849433&group_id=9863&atid=309863
It is thought to make the most of it as a material to proceed in a solution of a problem.
Nice catch!
For our purposes, we could apply that patch, or simply comment out all WM_ERASEBACKGND handling in wxNotebook::MSWWindowProc (reducing it to forwarding all events to wxControl::MSWWindowProc). Final wx solution will probably look different, but we don't need to care.
My next binary snapshot upload will include this solution, fixing.
Regards, Andreas
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