Jinoh Kang (@iamahuman) commented about dlls/ddraw/surface.c:
static HRESULT WINAPI DECLSPEC_HOTPATCH ddraw_surface1_Flip(IDirectDrawSurface *iface, IDirectDrawSurface *src, DWORD flags) {
- struct ddraw_surface *dst_impl = impl_from_IDirectDrawSurface(iface);
This flips along XY unconditionally; please respect the flags so we only flip around the correct axis.