Flaky test: AxHost_GetIFontFromFont_InvokeSimpleStyle_Roundtrips

[RussKie]

• .NET Core Version: master @ 3750c43

Problem description:

AxHost_GetIFontDispFromFont_InvokeSimpleStyle_Roundtrips test fails locally from cli and VS:

  Message: 
    Assert.Equal() Failure
    Expected: 0
    Actual:   254
  Stack Trace: 
    AxHostTests.AxHost_GetIFontFromFont_InvokeSimpleStyle_Roundtrips() line 1083

Expected behavior:

The test pass

/cc: @hughbe

[weltkante]

One thing I notice is that the port of IFont is missing two interface methods (added annotations [1] [2] in the original commit) - but I don't think those can be responsible here because they come after the method reading the charset property. Created #2007 since its a separate issue.

Something else: is AxHost_GetIFontDispFromFont_InvokeSimpleStyle_Roundtrips done on STA, being only annotated with a [Fact] attribute? I don't know if OLE ActiveX functions are working correctly outside STA ... considering that the OleInitialize native API initializes the thread to STA I'd expect all OLE functions to require STA ... in this case it might be solved together with #1999 by using the proper test annotations