[okular] [Bug 471399] New: Add support for subpage navigation

[Jussi Pakkanen]

https://bugs.kde.org/show_bug.cgi?id=471399

            Bug ID: 471399
           Summary: Add support for subpage navigation
    Classification: Applications
           Product: okular
           Version: unspecified
          Platform: Other
                OS: All
            Status: REPORTED
          Severity: wishlist
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: jpakkane at gmail.com
  Target Milestone: ---

Created attachment 159868
  --> https://bugs.kde.org/attachment.cgi?id=159868&action=edit
Sample PDF document

It is possible to create PDFs that work like presentations, i.e. have bullet
items appear and disappear within a single page.

This is done with Optional Content Groups, which Okular already supports.
However navigation within a page that uses the PresSteps dictionary (PDF spec
2.0, 12.4.4.2) does not work even in presentation mode.

I have attached a simple PDF document that has subpage navigation. The only way
to see how it should really work is to open it in Acrobat Reader, start
presentation mode and keep tapping the right arrow (or left, if you want to go
backwards). No other PDF viewer software I tried handles subpage navigation.

Note that this part of the PDF spec is not particularly well documented.
[Here's a relevant bug in the PDF association's bug
tracker](https://github.com/pdf-association/pdf-issues/issues/304).

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