Layers are not properly closed when using more than one layer, so that each
layer subsumes all subsequent content. Tested in Adobe Reader 11. I first
mentioned this at https://tex.stackexchange.com/a/467005/174577, so I'm
basically rehashing all the examples:
When \showallmakeup is enabled, all content after \viewerlayer[print]
belongs to that layer:
\defineviewerlayer[print][state=stop,printable=yes,]
\showallmakeup
\starttext
\viewerlayer[print]{One} more.
\samplefile{knuth}
\stoptext
The same problem as above, demonstrated with \start...stopviewerlayer
rather than \viewerlayer:
\defineviewerlayer[print][state=stop,printable=yes,]
\showallmakeup
\starttext
\startviewerlayer[print]
And then:
\stopviewerlayer
\samplefile{knuth}
\stoptext
Rather than two independent layers, the print layer (along with other
content) belongs to the view layer. So hiding the view layer hides all
content in this document:
[view]
--- first
--- \samplefile{knuth}
--- [print]
------ second
\defineviewerlayer[print][state=stop,printable=yes,]
\defineviewerlayer[view][state=start,printable=no,]
\starttext
\startviewerlayer[view]{first}
\samplefile{knuth}
\startviewerlayer[print]{second}
\stoptext
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