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On 2/13/2020 03:56, Hans Hagen wrote:
On 2/13/2020 12:45 AM, Rik Kabel wrote:
Perhaps there is something in the difference between annotations and attachments that results in different treatments by the various viewers. it has always been that messy; there's also the annotation symbol treatment that can differ; it doesn't help that acrobat changed behaviour a couple of times i think
this is why the whole attachment handling was as it is: some comprimise that kind of made them show up ok on the average; but validatin spoiled this and now we're stick with these incompatible viewer behaviour .. not much we can do about it i fear
(For instance, i remember that at some point acrobat showed attachments twice in some lists. Often these features ended up in specs without viewer support yet so probably not well tested for interferences either.)
Hans
The further I look into bookmark, annotation, and attachment handling by a number of viewers, the more confusing things appear. And Acrobat still shows attachments twice under some circumstances, with the helpful flyover for one entry giving the location as the associated page number, and for the other giving it as the attachments tab. What is more troublesome on the ConTeXt side is the validation issue with the appearance dictionary for visible attachments. The difference between validators when looking at the hidden attachment in my example hinges on the handling of the attachment mime type. I have filed a defect report with VeraPDF, which appears to be rejecting valid mime type that includes a charset clause. -- Rik