Fwd: issue: "printable" viewer layers lack compatibility

Fwd: issue: "printable" viewer layers lack compatibility

[User 19087]

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In 2017 ghostscript added support for the /Print and /View keys of the
Optional Content /Usage dictionary[1]. The use of '-dPrinted' should
display the print-only layer, per the documentation[2]:

gs -o output.pdf -sDEVICE=pdfwrite -dPrinted input.pdf

From their repository you can see that poppler (i.e. evince) also checks
the /Print and /View keys[3].

I'm reporting this here since neither render ConTeXt's "printable" viewer
layers - not while viewing, and not after printing.

[1]
http://git.ghostscript.com/?p=ghostpdl.git;h=9e621d6ffb0e29c5de8331bf2c95003c8cf85941
[2] https://ghostscript.com/doc/current/Use.htm#PDF_switches
[3]
https://gitlab.freedesktop.org/poppler/poppler/blob/master/poppler/OptionalContent.cc#L328

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