Intellisense offers wrong suggestion after dismissal and re-opening in context of switch-case

[JoshVarty]

Version Used: 15.0.0.+26228.9

Steps to Reproduce:

public sealed class VSConstants
{
    public enum VSStd2KCmdID
    {
        TYPECHAR = 1,
    }

    public enum VSStd97CmdID
    {
        Expand = 187,
    }
}

class Program
{
    static void Main(string[] args)
    {
        switch((VSConstants.VSStd97CmdID)5)
        {
             //Begin typing here vvvv
            case VSConstants.
        }
    }
}

1. Type vss
2. Observe completion list is correct.
3. Dismiss completion. (Esc)
4. Open completion (Ctr-space)
5. Observe that incorrect item has been inserted and selected in list.

[CyrusNajmabadi]

@rchande didn't you fix something where we were offering the full enum preselect when a person was typing after a dot?

[rchande]

@CyrusNajmabadi This case is interesting. We correctly type infer that VSConstants.VSStd97CmdID is required and call ToMinimalDisplayString on it. However, ToMinimalDisplayString doesn't account for any qualification that might appear before the position we pass in. It produces the most sensible minimal display string, which is, in fact, `VSConstants.VSstd97CmdID. We'll need to do some work to trim off any qualification that's already present. Do you know if we have any helpers that can already do that?

[JoshVarty]

I'm not sure if this is related, but in the following code, the suggestion VSStd2K is missing from the list.

Note: I cannot get this to repro with the above code, but it repros if you add a reference to Microsoft.VisualStudio.Shell.15.0

var guid = VSConstants.VSStd; //<-Bring up Intellisense here