Rude edits do not appear in refactoring preview

[sharwell]

Version Used: Visual Studio 2019 Preview 2

🔗 Originally filed as https://devdiv.visualstudio.com/DevDiv/_workitems/edit/123201

Steps to reproduce:

1. Create a new .NET Framework Console application.

2. Add some functioning code to Main()--it doesn't really matter what it is.

3. Set a breakpoint at the beginning of Main().

4. Start debugging.

5. Add the following to Main():

   var b = new Blah();

6. Open the light bulb and select the item to generate a new nested type named Blah in the same file.

Expected:

Preview shows a purple squiggle under private class Blah() because it will be a rude edit.

Actual:

No squiggle in the preview. It doesn't show up until the code for the new type is generated.

[CyrusNajmabadi]

Not plannign on doing this.