Markdown.ToHtml throws IndexOutOfRangeException in StringSlice.NextChar()

[mschessler]

Tested Version: newest commit d1233ff on main

Reproducer:

var pipeline = new MarkdownPipelineBuilder().UseAdvancedExtensions().Build();
var result = Markdown.ToHtml("+-\t\r\n|\r\n+-", pipeline);

Stacktrace:

at System.ThrowHelper.ThrowIndexOutOfRangeException()
at System.String.get_Chars(Int32 index)
at Markdig.Helpers.StringSlice.NextChar() in \src\Markdig\Helpers\StringSlice.cs:line 167
at Markdig.Extensions.Tables.GridTableParser.IsRowSeparator(StringSlice slice) in \src\Markdig\Extensions\Tables\GridTableParser.cs:line 170
at Markdig.Extensions.Tables.GridTableParser.SetRowSpanState(List`1 columns, StringSlice line, Boolean& isHeaderRow, Boolean& hasRowSpan) in \src\Markdig\Extensions\Tables\GridTableParser.cs:line 147
at Markdig.Extensions.Tables.GridTableParser.HandleNewRow(BlockProcessor processor, GridTableState tableState, Table gridTable) in \src\Markdig\Extensions\Tables\GridTableParser.cs:line 116
at Markdig.Extensions.Tables.GridTableParser.TryContinue(BlockProcessor processor, Block block) in \src\Markdig\Extensions\Tables\GridTableParser.cs:line 97
at Markdig.Parsers.BlockProcessor.TryContinueBlocks() in \src\Markdig\Parsers\BlockProcessor.cs:line 663
at Markdig.Parsers.BlockProcessor.ProcessLine(StringSlice newLine) in \src\Markdig\Parsers\BlockProcessor.cs:line 498
at Markdig.Parsers.MarkdownParser.ProcessBlocks(BlockProcessor blockProcessor, String text) in \src\Markdig\Parsers\MarkdownParser.cs:line 113
at Markdig.Parsers.MarkdownParser.Parse(String text, MarkdownPipeline pipeline, MarkdownParserContext context) in \src\Markdig\Parsers\MarkdownParser.cs:line 56
at Markdig.Markdown.ToHtml(String markdown, MarkdownPipeline pipeline, MarkdownParserContext context) in\markdig\src\Markdig\Markdown.cs:line 101
at FuzzTest.Program.Main(String[] args) in \FuzzingTargets\MarkdigFuzzer\Program.cs:line 13