[Bug 50849] Multiple .NET 4.x app installers using WiX v3 'InvokeOutOfProcManagedCustomAction, CAInvokeMethod->Invoke_3 return incorrect result with Wine-Mono (Elgato Stream Deck 4.9.3, Garmin Express 6.13)

[WineHQ Bugzilla]

https://bugs.winehq.org/show_bug.cgi?id=50849

--- Comment #3 from Esme Povirk <madewokherd at gmail.com> ---
Thanks for tracking this down. pCAInvokeMethod is declared as a _MethodInfo,
which is an interface defined in the standard library. Based on signatures, I
think Invoke_3 is this method:

                Object Invoke(Object obj, Object[] parameters);

MSDN link:
https://docs.microsoft.com/en-us/dotnet/api/system.runtime.interopservices._methodinfo.invoke?view=netframework-4.7.2#System_Runtime_InteropServices__MethodInfo_Invoke_System_Object_System_Object___

The Object return value is implicitly pulled into an output parameter and
HRESULT return on the COM side.

Given they're accessing this through intVal, I guess they expect a VT_INT or
VT_I4.

Variant marshaling goes through the Marshal.GetNativeVariantForObject method,
so we can trace that to find the object being converted:
[0000000000000130: 0.00000 0] ENTER:c
System.Runtime.InteropServices.Marshal:GetNativeVariantForObject
(object,intptr)([INT32:0000000001c596c8:0], 000000000061f2b0)

By examination of System.Variant.SetValue, that should produce a VT_I4, so
something weird is going on here.

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