Wrong source positions for Tables with empty TableHead/TableBody

[fjalowski]

For TableBlocks containing either an empty TableHead or an empty TableBody (or both) the start position of the TableBlock is always set to 0, even if there are other things before the table. The start and end position of the empty head/body are both 0 in that case.

For example, this markdown:

foo

---|---

turns into this AST:

Document[0, 12]
  Paragraph[0, 4] isTrailingBlankLine
    Text[0, 3] chars:[0, 3, "foo"]
  TableBlock[0, 12]
    TableHead[0, 0]
    TableSeparator[5, 12]
      TableRow[5, 12]
        TableCell[5, 9] text:[5, 8, "---"] textClose:[8, 9, "|"]
          Text[5, 8] chars:[5, 8, "---"]
        TableCell[9, 12] text:[9, 12, "---"]
          Text[9, 12] chars:[9, 12, "---"]
    TableBody[0, 0]

I would expect the start of the TableBlock to be 5, the start and end of the TableHead to be 5 and the start and end of the TableBody to be 12.

[vsch]

@fjalowski, thank you for catching it. Its a bug. TableHead should have position [5,5] and table body [12,12].

I will get a fix out.

[vsch]

@fjalowski, test added. release in progress.

Here are the corrected results:

```````````````````````````````` example Issue 216: 3
foo

---|---

.
<p>foo</p>
<table>
  <thead></thead>
  <tbody></tbody>
</table>
.
Document[0, 14]
  Paragraph[0, 4] isTrailingBlankLine
    Text[0, 3] chars:[0, 3, "foo"]
  TableBlock[5, 13]
    TableHead[5, 5]
    TableSeparator[5, 12]
      TableRow[5, 12]
        TableCell[5, 9] text:[5, 8, "---"] textClose:[8, 9, "|"]
          Text[5, 8] chars:[5, 8, "---"]
        TableCell[9, 12] text:[9, 12, "---"]
          Text[9, 12] chars:[9, 12, "---"]
    TableBody[12, 12]
````````````````````````````````

[vsch]

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