Symbols of footnotes not raised inside mdframed

Question

I want to change the symbols of footnotes inside mdframed. I found there is quite simple solution for that, in this very very helpful answer to the same problem.

I applied it and it works but the symbols, asterinks, daggers etc, are aligned to the text and not raised as the footnotes usually are.

I tried to raise them with raisebox

\documentclass[9pt,twoside,openright,showtrims]{memoir} 
\usepackage{amsmath,amssymb,amsfonts}
\usepackage{mathspec,xltxtra}
\usepackage{url,graphicx}
\usepackage{polyglossia}

\usepackage{geometry}
\usepackage{layouts}
\usepackage{calc}
\usepackage{tablefootnote} 
\usepackage[framemethod=PSTricks,tikz]{mdframed}


\makeatletter
\AtBeginEnvironment{mdframed}{%
\def\@fnsymbol#1{\ensuremath{\ifcase#1\or \dagger\or \ddagger\or
\mathsection\or \mathparagraph\or \|\or **\or \dagger\dagger
\or \ddagger\ddagger \else\@ctrerr\fi}}%
}   
\renewcommand\thempfootnote{\raisebox{.8ex}{\small \fnsymbol{mpfootnote}}}
\makeatother

but i get errors. The asterisk is raised in the mark but i get this at the end of the frame.

Actually, i had the same problem even before i changed the numbering to symbols. By default, the numbering was a, b, c..., even then, they were not raised.

Do you have any ideas for a way to raise them without errors?

Answer 1

The problem isn't mdframed but xltxtra. the latter redefines \textsuperscript (and \textsubscript) to use real superior figures instead of normal figures in a smaller font size. This only works reliably if a font has the glyphs available: superscripts with xelatex? (footnotes, natbib) The package does define starred variants of both commands through which the original definitions are available.

Since the footnote mark is placed with \textsuperscript you get the problems here. One solution is to load the package with the no-sscript option.

\usepackage[no-sscript]{xltxtra}

This swaps the definitions: \textsuperscript gives the original definition, \textsuperscript* the one for the superior figures.

The other solution of course is not to use the package at all.