Editor Completion - Partners - Debugger - Support completion in debugger

[ivanbasov]

1. Roslyn does not provide any items when ‘$’ is the first char typed. The user experience would be a lot better if all items would be present but filtered out
2. Even if our “$...” items are in the completion list they are not scrolled to or filtered correctly. Ex. Start a session by typing x, then backspace, then $

[dpoeschl]

There's much further discussion in the email thread.