As shown in Issues with leipzig and glossaries used together, there is a problem when using the package leipzig with the glossaries package since the leipzig package relies on deprecated commands from glossaries.
The answer to the question solves the issue, but the answer suggests modifying the .sty file, which I would rather not do.
I have tried to patch the \SetLeipzigDisplayStyle command, but I have not been successful. According to egreg's answer to Please tutor the usage of patchcmd and xpatch, one should use xpatch when trying to patch a command with an optional argument. \SetLeipzigDisplayStyle is such a command, but trying to patch it with \xpatchcmd does not work for me. How can I fix the issue without resorting to (copying and) modifying the .sty file?
MWE
% !TEX TS-program = arara
% arara: pdflatex
% arara: makeglossaries
% arara: pdflatex
% arara: pdflatex
\documentclass{article}
\usepackage{expex}
\usepackage[nomain,nostyles]{glossaries}
\usepackage{glossary-inline}
\usepackage{leipzig}
\makeglossaries
\usepackage{xpatch}
\xpatchcmd{\SetLeipzigDisplayStyle}{%
\defglsdisplay[#1]{\leipzigfont{##1}##4}%
\defglsdisplayfirst[#1]{\firstleipzigfont{##1}##4}%
}{%
\renewcommand*{\glstextformat}[1]{\leipzigfont{#1}}%
}{}{}
\begin{document}
\ex
\begingl
\gla mulle//
\glb \First\Sg:\Dat{}//
\endgl
\xe
go.\Pst{}
\printglossary[style=inline,type=\leipzigtype]
\end{document}
You can see that it still produces the problem noted in Issues with leipzig and glossaries used together.

.logfile for that error and nothing comes up. – Adam Liter Mar 02 '15 at 03:27\SetLeipzigDisplayStyle. Why not just redefine it then rather than patching it? Also, do you want to redefine it to..##1..rather than..#1..? – Werner Mar 02 '15 at 04:53:)I can't seem to get that to work, either, though.\renewcommand*{\SetLeipzigDisplayStyle}[1]{\renewcommand*{\glstextformat}[1]{\leipzigfont{#1}}}doesn't work, which is why I ended up trying to patch it. I'm sort of curious why patching doesn't seem to work, but also, at this point, any solution would be fine. As for#1vs.##1, I'm honestly not sure what the difference is. Does this have something to do withglossaries? I was just trying to change it to the accepted solution in the linked question. – Adam Liter Mar 02 '15 at 05:07\renewcommand. – egreg Mar 02 '15 at 07:39