[Bug 50539] New: SetWindowRgn doesn't work correctly

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50539

            Bug ID: 50539
           Summary: SetWindowRgn doesn't work correctly
           Product: Wine
           Version: 6.0
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: user32
          Assignee: wine-bugs at winehq.org
          Reporter: hjkl at quantentunnel.de
      Distribution: ---

Created attachment 69208
  --> https://bugs.winehq.org/attachment.cgi?id=69208
Example images and source code

The SetWindowRgn function doesn't work correctly. It applies a shape to a
window. In the attachment is an example source code which just creates 2
windows and calls SetWindowRgn on both. It uses an elliptic region on the left
window and a triangle region on the right one.

The image "CorrectOnWindows.png" shows how Windows 10 draws it.
The image "IncorrectOnLinuxWithWine.png" shows how Wine on Debian draws it
(also tested on Zorin OS with the same result).

The elliptic window has a black "shadow" above the window. This might be the
same issue as described in "Bug 48636", but I'm not sure.
The other window has no shape at all. It's just drawn like SetWindowRgn was
never called.

The folder "source" of the attached ZIP file contains the Visual Studio 2019
source project and also the compiled EXEs for 32-bit and 64-bit. It's very
simple.
The interesting part is this for the 1st window:

    //example 1 with an elliptic region
    HRGN hRgn=CreateEllipticRgn(0, 0, 250, 200);

    SetWindowRgn(g_hWnd1, hRgn, TRUE);

And this for the 2nd window:

    //example 2 with a triangle region
    POINT points[8];

    points[0].x=50;
    points[0].y=0;
    points[1].x=100;
    points[1].y=100;
    points[2].x=0;
    points[2].y=100;
    points[3].x=50;
    points[3].y=0;
    points[4].x=50;
    points[4].y=20;
    points[5].x=80;
    points[5].y=90;
    points[6].x=20;
    points[6].y=90;
    points[7].x=50;
    points[7].y=20;
    hRgn=CreatePolygonRgn(points, 8, ALTERNATE);

    SetWindowRgn(g_hWnd2, hRgn, TRUE);

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