Regression - DxDiag 'Ddraw test' does not longer display the moving white rectangle in windowed mode even

0.4.12-dev-1001-g0c4d21a gcc dbg linux
Dxdiag used on VBox 4.3.12 (without additions) + VBEMP + ros inbuilt Mesa

In earlier revisions we completed the second test still where the white rectangle moves over the screen in windowed mode (and crashed later only when we would operate in fullscreen)

Current head 0.4.12-dev-1001-g0c4d21a fails even in windowed mode, shows only a black window and logs

err:(win32ss/user/user32/windows/messagebox.c:1048) MessageBox: L"Dieser Test wird DirectDraw benutzen, um im Offscreen-Buffer zu zeichnen. Ein bewegtes wei\00dfes Rechteck sollte zu sehen sein. Fortfahren?"

err:(dll/directx/wine/wined3d/context.c:1808) >>>>>>> GL_INVALID_ENUM (0x500) from extension detection @ ../dll/directx/wine/wined3d/directx.c / 4310.

I could imagine the GL_INVALID_ENUM being related. <- update: the logging seems to be unrelated
0.4.12-dev-1001-g0c4d21a.webm

I did not bisect yet to find the guilty rev. I expect that problem to vanish in the next release thanks to the usual sledge-hammer-revert of WineDX.