wp_text_diff creates wrong number of columns html table using $args

[iamklaus]

wp_text_diff creates a wrong number of columns html table. Here is my HTML output:

<table class='diff'>
<col class='content' /><thead><tr class='diff-title'><th colspan='4'>Differences</th></tr>
<tr class='diff-sub-title'>
	'''<td></td>'''<th>Old Version</th>
	'''<td></td>'''<th>New Version</th>
</tr>
</thead>
<tbody>
<tr><td class='diff-context'>asdfsadfasdfasd</td><td>&nbsp;</td><td class='diff-context'>asdfsadfasdfasd</td></tr>
<tr><td class='diff-deletedline'>fgsdvvdddTTfbgd fcccccdfsdcddfdvvv sdfdsf fgs sdfkjdnsfs fsadf asdf asdf sadf asd f <del>asd</del> f asd fas df asd f sad f asvd f asdfasdfasdfasd f asdf asd f asdf asdfasdfas
</td><td>&nbsp;</td><td class='diff-addedline'>fgsdvvdddTTfbgd fcccccdfsdcddfdvvv sdfdsf fgs sdfkjdnsfs fsadf asdf asdf sadf asd f <ins>afsd</ins> f asd fas df asd f sad f asvd f asdfasdfasdfasd f asdf asd f asdf asdfasdfas
</td></tr>
<tr><td class='diff-deletedline'><del>dsdfsadfasdf</del> asdf asdf asdf sdfasd
</td><td>&nbsp;</td><td class='diff-addedline'><ins>dsdfsafdfasdf</ins> asdf asdf asdf sdfasd
</td></tr>
<tr><td class='diff-context'>fsadfasdfasdfasdfasdfasdfasdfds fa sdf sadf sd fgsd fgdsf gs dfg dsfg sdfg d gergt ewr gerth rtzj rtzu tzu trzj dfg j gtn fdg ndfg b sdfghVVrthsdf g sdf dsfgsdf gdsfg  sdf g sdfgdsfgsdfg</td><td>&nbsp;</td><td class='diff-context'>fsadfasdfasdfasdfasdfasdfasdfds fa sdf sadf sd fgsd fgdsf gs dfg dsfg sdfg d gergt ewr gerth rtzj rtzu tzu trzj dfg j gtn fdg ndfg b sdfghVVrthsdf g sdf dsfgsdf gdsfg  sdf g sdfgdsfgsdfg</td></tr>
<tr><td class='diff-context'>sdfgsdfgdsfgsd</td><td>&nbsp;</td><td class='diff-context'>sdfgsdfgdsfgsd</td></tr>

</tbody>
</table>

[iamklaus]

Rendered HTML

[SergeyBiryukov]

Hi @iamklaus, welcome to Trac!

Thanks for the report, we're already tracking this issue in #25473.