I attach a simple tex file and the pdf it produces to illustrate the problem.
We set the ~ character to catcode 12 so that it can function normally in devanagari text (typed in the tex file in roman). When j and ~n come together in a word, then they produce the conjunct consonant as seen in the pdf file, but when the same j and ~n come together in the same word in a footnote, the catcode for ~ seems to revert to 13 and it causes the interword space. How do I make that ~ function in the footnote as it does in the text? Thanks in advance for any help or for any suggestions for other fora to use to solve this problem.
jnaana.pdf
Description: jnaana.pdf
\documentclass{article}
\usepackage{fontspec}
\setmainfont{IndUni-P}
\newcommand\dn{\catcode`\~=12
\fontspec{Chandas}[Script=Devanagari,Mapping=velthuis-sanskrit]}
\begin{document}
{\dn j~nAna}\footnote{The meaning of this is {\dn j~nAna}.} {\dn vidyA}
\end{document}
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