Reproduce 16.7 Visual Studio issue

[GrahamTheCoder]

Not a real PR - just a place to keep the cut down repro for #586

Repro steps:

• Launch Visual Studio 16.7.0 preview 3.1 or later with this branch's extension installed (either install the CI build, or launch the VSIX project from source)
• Create a new visual basic .net framework console project.
• Right click on a .vb file in the solution explorer
• Click "Convert to C#"

It will reasonably directly invoke the code added on this branch, and throw a very odd exception attempting to rename a namespace.

StreamJsonRpc.RemoteInvocationException : Unexpected false
   at async StreamJsonRpc.JsonRpc.InvokeCoreAsync[TResult](<Unknown Parameters>)
   at async Microsoft.CodeAnalysis.Remote.RemoteEndPoint.InvokeAsync[T](<Unknown Parameters>)
   at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)
---> (Remote Exception) {
  "type": "System.InvalidOperationException",
  "message": "Unexpected false",
  "stack": "   at Roslyn.Utilities.Contract.Fail(String message)
   at Roslyn.Utilities.Contract.ThrowIfFalse(Boolean condition)
   at Microsoft.CodeAnalysis.Remote.SolutionCreator.<UpdateProjectInfoAsync>d__10.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
   at Microsoft.CodeAnalysis.Remote.SolutionCreator.<UpdateProjectAsync>d__9.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
   at Microsoft.CodeAnalysis.Remote.SolutionCreator.<UpdateProjectsAsync>d__7.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.Remote.SolutionCreator.<UpdateProjectsAsync>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
   at Microsoft.CodeAnalysis.Remote.SolutionCreator.<CreateSolutionAsync>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at Microsoft.VisualStudio.Telemetry.WindowsErrorReporting.WatsonReport.GetClrWatsonExceptionInfo(Exception exceptionObject)
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.Remote.SolutionService.<CreateSolution_NoLockAsync>d__14.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.Remote.SolutionService.<GetSolutionAsync>d__13.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.Remote.CodeAnalysisService.<>c__DisplayClass31_0.<<RenameSymbolAsync>b__0>d.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.CodeAnalysis.Remote.ServiceBase.<RunServiceAsync>d__14`1.MoveNext()",
  "code": -2146233079,
  "inner": null
}

---

Similar cases where I couldn't repro the issue:

• Real VB project in MSBuildWorkspace
• Programmatically adding a project to a AdhocWorkspace
• Programmatically adding a project to VisualStudioWorkspace's solution

[GrahamTheCoder]

Issue remains, but this pr was just an example, so closing