FileSystemTabCompletionSource when the completion has files with spaces

[K2]

Thanks for the tool, i'm using the dev branch to include some of your more recent fixes (I did a fresh clone about a minute a go).

In a REPL mode if your expansion has spaces in it, the quoting that happens will start to break the interface. i.e. c:\p[tab] that will expand out, if you just hit tab a few more times, things go haywire in TryComplete for FileSystemTabCompletionSource.

It looks like when get the next tab, the processing is OK in the TryComplete but when it passes the next string back down, the cursor position isn't placed properly back and one of the methods down in the ConsoleString.ReadLine loop will start indexed from LastIndexOf '" " or something since you wind up (3 quotes)

"c:\Program "c:\Program Files (x86)"

Seems easy enough to fix by having the previous cursor left reset, I just had a few other things to work on ;)