CORE-15905 DxdDiag second Ddraw Test, Drawing Offscreen Buffer in windowed mode does only draw a black window without any content

0.4.12-RC-3-g55ea318 gcc dbg win selfbuilt                     affected, black window only in windowed mode
reactos-bootcd-0.4.12-dev-1001-g0c4d21a-x86-gcc-lin-dbg.iso    affected, black window only in windowed mode
reactos-bootcd-0.4.12-dev-857-g0425d86-x86-gcc-lin-dbg.iso     affected, black window only in windowed mode
reactos-bootcd-0.4.12-dev-780-g026c575-x86-gcc-lin-dbg.iso     affected, black window only in windowed mode
reactos-bootcd-0.4.12-dev-776-gb6262a2-x86-gcc-lin-dbg.iso     affected, black window only in windowed mode guilty/unhider is https://git.reactos.org/?p=reactos.git;a=commit;h=b6262a25fd0a21de10af78ce84cdf0b6add2978f [WIN32SS] jimtabor
reactos-bootcd-0.4.12-dev-775-g1114b89-x86-gcc-lin-dbg.iso     ok, white rectangle moves in windowed mode
reactos-bootcd-0.4.12-dev-774-gc2b6c3a-x86-gcc-lin-dbg.iso     ok, white rectangle moves in windowed mode
reactos-bootcd-0.4.12-dev-773-gbbfb3ca-x86-gcc-lin-dbg.iso     ok, white rectangle moves in windowed mode
reactos-bootcd-0.4.12-dev-767-g1001e60-x86-gcc-lin-dbg.iso     ok, white rectangle moves in windowed mode
reactos-bootcd-0.4.12-dev-754-gb65ec6f-x86-gcc-lin-dbg.iso     ok, white rectangle moves in windowed mode
reactos-bootcd-0.4.12-dev-730-gfb34029-x86-gcc-lin-dbg.iso     ok, white rectangle moves in windowed mode
reactos-bootcd-0.4.12-dev-638-gd9c4d28-x86-gcc-lin-dbg.iso     ok, white rectangle moves in windowed mode
reactos-bootcd-0.4.12-dev-8-g958ae44-x86-gcc-lin-dbg.iso       ok, white rectangle moves in windowed mode