IntelliSense - Display names of properties assignable by an object initializer in auto-completion list without needing editor.wordBasedSuggestions.

[seraku24]

Environment data

dotnet --info output:

.NET Command Line Tools (1.0.0-preview2-003121)

Product Information:
 Version:            1.0.0-preview2-003121
 Commit SHA-1 hash:  1e9d529bc5

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.10586
 OS Platform: Windows
 RID:         win10-x64

VS Code version: 1.4.0
C# Extension version: 1.3.0

Steps to reproduce

1. Disable editor.wordBasedSuggestions.
2. Type the open curly brace that begins an object initializer. (See the following code snippet.)

class Person {
    public string FirstName;
    public string LastName;
}

static class Program {
    private static void Main() {
        var chemist = new Person { FirstName = "Walter", LastName = "White", };
    }
}

This issue occurs after typing new Person {.

Expected behavior

The names of any assignable properties are shown in the auto-completion list.

Actual behavior

No property names are included in the auto-completion list.

Like issue #652, the editor option editor.wordBasedSuggestions might show the property names only as a side effect. The expectation is that IntelliSense recognizes an object initializer and displays the writable properties of the object, which matches the behavior seen in Visual Studio.

[ivanz]

This is dupe of #260