colspanned columns should inherit tag

[takuy]

Colspanned columns need to inherit the tag of the original column. Otherwise, in a header row, this leaves you with a bunch of th tags separated by tds tags (since the default is to treat an empty tag as td per

edittable/action/editor.php

Line 222 in 09298ea

$last = ($meta[$row][$col]['tag'] == 'th') ? '^' : '|';

)

When the array is parsed by build_table, this means the table is actually malformed per DokuWiki syntax and what should be a ^ ends up being a |; this later generates bad or unexpected HTML - th elements end up in tbody instead of thead.