[XeTeX] Low-level diagnostic ("fwrite") generated by XeTeX

[David J. Perry]

If the original author of the PDF has enabled it, someone reading the PDF 
can apply all sorts of annotations and comments.  This is a very common way 
to get documents reviewed.

David

> Since, AFAIK, Adobe Reader doesn't change files (it is a reader not
> writer), it shouldn't lock the file in the first place. This what other
> document viewers (Evince here) does, actually it also recognize that the
> file has been updated and reload it.