Here's a minimal case:
\documentclass[]{article}
\usepackage{hyperref}
\begin{document}
\section{\%á}
\end{document}
Without this change, this fails on the second invocation of xelatex.
See https://tex.stackexchange.com/questions/313266/and-non-ascii-characters-in-headings
This affects inputs this like
# %á
with pdf output via xelatex.
* Added `thanks` variable
* Use `parskip.sty` when `indent` isn't set (fall
back to using `setlength` as before if `parskip.sty`
isn't available).
* Use `biblio-style` with biblatex.
* Added `biblatexoptions` variable.
* Added `section-titles` variable (defaults to true)
to enable/suppress section title pages in beamer
slide shows.
* Moved beamer themes after fonts, so that themes can
change fonts. (Previously the fonts set were being
clobbered by lmodern.sty.)
- only pass options to color package if colorlinks is set
- make definition of `\euro` conditional in xelatex/lualatex,
as it is already for pdflatex
(Andrew Dunning)
* Removed setting of `subject` in PDF metadata.
This used to be set to the subtitle, but really the subtitle
need not give the subject. Also, `subtitle` can contain formatting,
so we'd need, at least, a plain text version for this.
* Moved `header-includes` before setting of `\title`, `\author`,
etc. This allows these macros to be redefined.
* Use `\subtitle` command for `subtitle`, instead of tacking it
on to the title as before. We give a no-op fallback definition if it is
not defined. This change should produce much better results
in classes that support `\subtitle`. With the default article
class, which does not define `\subtitle`, subtitles will no
longer be printed unless the user defines `\subtitle` and
redefines `\maketitle`.
* Moved redefinitions of `\paragraph` and `\subparagraph` to
before header-includes.
