DefWindowProc should pass unhandled WM_MOUSEWHEEL to parent, according
to documentation.
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@ -331,6 +331,14 @@ static LRESULT DEFWND_DefWinProc( WND *wndPtr, UINT msg, WPARAM wParam,
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}
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break;
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case WM_MOUSEWHEEL:
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if (wndPtr->dwStyle & WS_CHILD)
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{
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return SendMessageA( wndPtr->parent->hwndSelf,
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WM_MOUSEWHEEL, wParam, lParam );
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}
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break;
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case WM_ERASEBKGND:
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case WM_ICONERASEBKGND:
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{
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