Try the following:
\documentclass{article}
\usepackage{xltxtra}
\setmainfont[Mapping=tex-text,Numbers=OldStyle,Ligatures={Required,Common,Rare}]{Junicode}
\begin{document}
Fifty afflicted fjords.
\end{document}
Load the PDF, and search for any of the words.
The "fty", "ct" and "fj" ligatures aren't in Unicode, and the private-use
characters obviously can't be decomposed by the PDF viewer. The same
problem will obviously occur for variant letter shapes, old-style digits,
etc.
But scanned documents in PDF often have an invisible text layer attached
which can be searched, etc.; is it possible to use the same technique to put
the decomposed letters over the visible private-use characters, so that
documents remain searchable (and copy/paste-able)?
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