Commits on Mar 12, 2024

1. [api-minor] Implement basic support for OptionalContent Usage dicts… …

   … (issue 5764, bug 1826783)
   
   The following are some highlights of this patch:
    - In the Worker we only extract a *subset* of the potential contents of the `Usage` dictionary, to avoid having to implement/test a bunch of code that'd be completely unused in the viewer.
   
    - In order to still allow the user to *manually* override the default visible layers in the viewer, the viewable/printable state is purposely *not* enforced during initialization in the `OptionalContentConfig` constructor.
   
    - Printing will now always use the *default* visible layers, rather than using the same state as the viewer (as was the case previously).
      This ensures that the printing-output will correctly take the `Usage` dictionary into account, and in practice toggling of visible layers rarely seem to be necessary except in the viewer itself (if at all).[1]
   
   ---
   [1] In the unlikely case that it'd ever be deemed necessary to support fine-grained control of optional content visibility during printing, some new (additional) UI would likely be needed to support that case.

   

   Snuffleupagus committed Mar 12, 2024
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2. Move the /SetOCGState handling into the OptionalContentConfig class… …

   … (PR 15377 follow-up)
   
   This helps ensure that /SetOCGState actions always take the `Usage` dictionary into account as expected.

   

   Snuffleupagus committed Mar 12, 2024
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