Better autocompletion example

[xmedeko]

I find the autocompletion example somewhat not usable. What about

var completions = new string[] { "status", "help", "state", "stx" };

// Configures auto-completion, in this example, the result
// is always to offer the numbers as completions
le.AutoCompleteEvent += delegate (string text, int pos) {
    string prefix = text.Substring(0, pos);
    string[] autocompletions;
    if (string.IsNullOrEmpty(prefix))
        autocompletions = completions;
    else
        autocompletions = completions
            .Where(c => c.StartsWith(prefix, StringComparison.OrdinalIgnoreCase))
            .Select(c => c.Substring(pos))
            .ToArray();
        return new Mono.Terminal.LineEditor.Completion(prefix, autocompletions);
};

It just have disadvantage, that it works on the line beginning only.