glossaries references produce two hyperref links

Question

I'm trying to achieve the effect from this existing question: \gls should produce hyperlinks, but without the distracting frames, while all other links behave as usual.

The answer to that question was to change the border color to white. However, this tends to obscure punctuation marks around the reference. I therefore tried to set pdfborder to zeros, but that seemed to have no effect.

After some trial and error, I ended up with this MWE:

\documentclass{article}
\usepackage{xcolor}
\usepackage{hyperref}
\usepackage{glossaries}

\newacronym{foo}{foo}{foobar}
\makenoidxglossaries

\defglsentryfmt[\glsdefaulttype]{\hypersetup{linkbordercolor=green,pdfborder=0 0 0.1}\glshyperlink[\glsgenentryfmt]{\glslabel}}

\begin{document}
    \section{\label{x}Foo}

    In Section~\ref{x} we saw that \gls{foo}.

    \printnoidxglossaries
\end{document}

Note how there are actually two borders, one affected by my settings, one unaffected. You can also see that the period is almost completely obscured, so a white border is undesirable. Where does this second hyperlink come from and how do I influence its appearance?

Answer 1

The format specified with \defglsentryfmt indicates the text that's used inside the hyperlink for commands like \gls. Since \defglsentryfmt has been redefined to use \glshyperlink, which inserts a hyperlink, this causes the nested hyperlinks.

It's actually better to simply redefine the command used to generate the hyperlinks. Internally, this is \@glslink but \glsenablehyper assigns this to the value of \glsdohyperlink, so you just need to redefine \glsdohyperlink and then use \glsenablehyper. Like this:

\documentclass{article}
\usepackage{xcolor}
\usepackage{hyperref}
\usepackage{glossaries}

\newacronym{foo}{foo}{foobar}
\makenoidxglossaries

\renewcommand*{\glsdohyperlink}[2]{%
 {\hypersetup{linkbordercolor=green}\hyperlink{#1}{#2}}}

\glsenablehyper

\begin{document}
    \section{\label{x}Foo}

    In Section~\ref{x} we saw that \gls{foo}.

    \printnoidxglossaries
\end{document}

This produces