[XeTeX] potential new feature: \XeTeXgenerateactualtext

[Jonathan Kew]

The code for the \XeTeXgenerateactualtext feature (it's an integer 
parameter; set it to 1 to get ActualText added to the PDF, for better 
copy/paste and search in Acrobat) is now on sourceforge, in an 
"actualtext" branch, for anyone who wants to try building and 
experimenting with it.

Note that this requires a new version of xdvipdfmx, as it uses a new DVI 
opcode. The patch for xdvipdfmx is attached here (based on the current 
TeXLive svn source).

Akira, if you could check that the patch seems OK, that would be great. 
I've not really looked at dvipdfm-x code in a long time. I haven't 
pushed this it to TL yet, as it's all rather experimental, but I hope we 
can safely include it for TL'16.

JK
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