gather/align, line starting with \text, mathml-SE

[nbeisert]

I noticed an warning message for gather/align/aligned (but neither multline nor gathered) when a line starts with \text and when mathml-SE is set:

\DocumentMetadata{testphase=latest}
\documentclass{article}
\tagpdfsetup{math/setup={mathml-SE}}

\begin{document}

\begin{gather}
x=y\\
\text{some text}\\
y=z
\end{gather}

\end{document}

This produces the warning:

Package tagpdf Warning: Structure 12 has 1 kids but no parent.
(tagpdf)                It is turned into an artifact.
(tagpdf)                Did you stashed a structure and then didn't use it?

I don't know what the warning means or whether anything broke, the pdf and html look fine. Invoking \relax before \text makes no difference. The warning disappears if there is any text preceding \text. Secondary cells in align are not affected either.

[u-fischer]

I means that the text is lost in the structure, there is nothing in the mtext:

If one add some text before it looks like this

So such warning indicates a bug.

[u-fischer]

@zauguin could you take a look? luamml loses the stash structure of the mtext if that it the only element in the cell.

\DocumentMetadata{uncompress,testphase=latest}
\documentclass{article}
\tagpdfsetup{math/setup={mathml-SE}}

\begin{document}
\begin{gather}
%x
\mbox{some text}
\\
\end{gather}

\end{document}

[zauguin]

Resolved in current luamml main branch.