Align LaTeX images to baseline

[!Tip] This is available as add-on 1721577833

By default, Anki renders LaTeX and includes the final images as-is. However, the bounding box of the resulting image might not necessarily coincide with the actual baseline of the equation. Using the widely available preview.sty, one can access the depth -- the offset from the baseline -- of the generated image and correct for that.

The Anki manual sports a picture of the default PNG rendering:

I've generally found it to be a bit better with SVGs + some CSS that just vertically centres the pictures:

This add-on gives a further improvement upon that:

In comparison with 1337660446, this add-on was written from scratch and tested with Anki 2.1+.

To use the add-on, you will need to include preview.sty in your LaTeX preamble:

% Header
\documentclass{article}
\usepackage[active,tightpage]{preview} % XXX
\usepackage{xcolor}
\begin{document}
\setlength{\parindent}{0in}
\setlength{\abovedisplayskip}{0pt}     % XXX better bounding boxes
\begin{preview}                        % XXX

% Footer
\end{preview}                          % XXX
\end{document}

If you use PNG output and not SVG output (which I would however advise against) then you will need to further adjust the LaTeX build process to include a --depth argument in the call to dvipng. For that, I suggest using 937148547.