Support emoji completions in review comments

[kycutler]

Closes #7178

[alexr00]

A few small changes, plus one thing that doesn't work they way I'd expect: If I type a full emoji expression (ex. :running:, I don't expect the picker to reset.

[kycutler]

A few small changes, plus one thing that doesn't work they way I'd expect: If I type a full emoji expression (ex. :running:, I don't expect the picker to reset.

Good catch! Updated so it will only trigger if the leading : appears after whitespace or beginning of line.

[alexr00]

The emoji picker doesn't reset now, but it does close. I think what I expected is that it still shows, just doesn't reset. I actually don't know if this is possible though since the second : is the trigger character.

Looks good!

[alexr00]

Oh, might be nice if a direct invoke ( CompletionTriggerKind.Invoke`, rather than trigger character) would show the completions even if not preceeded by whitespace.