Apply `foreach` on `class StringLineGroup` got phantom empty line, is it expected?

[Akarinnnnn]

I' m writing code to dump a FencedCodeBlock, here is the function:

        private static void HandleCodeBlock(FencedCodeBlock codeblock, int level)
        {
            Console.ForegroundColor = ConsoleColor.DarkYellow;
            if (!string.IsNullOrEmpty(codeblock.Info))
            {
                PrintIndent(level);
                Console.WriteLine($"lang: {codeblock.Info}, info args: {codeblock.Arguments}");
            }
            Console.ForegroundColor = ConsoleColor.White;

            foreach (var line in codeblock.Lines)
                Console.WriteLine(line);
        }

Then I see output contains suspicious empty line like this:

  FencedCodeBlock: 36/692-735 @1
 characters.sifeng.voice("c1s1", 3)

And the corresponding markdown is:
```
characters.sifeng.voice("c1s1", 3)
```

After some investigation, I found the enumerator of StringLineGroup returns internal array's enumerator directly. The array contains reserved slot for future item adding, that's the reason why we see phantom empty lines.

Shall we change the GetEnumerator() for StringLineGroup? I can provide some help.

[xoofx]

Shall we change the GetEnumerator() for StringLineGroup? I can provide some help.

Yep most likely, you can make a PR for a fix, thanks!

[Akarinnnnn]

Sorry for using incorrect email address. I will use correct information to commit later.