[okular] [Bug 438250] New: Transparent support for "PDF portfolios"

[Thomas Fischer]

https://bugs.kde.org/show_bug.cgi?id=438250

            Bug ID: 438250
           Summary: Transparent support for "PDF portfolios"
           Product: okular
           Version: 21.04.1
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: PDF backend
          Assignee: okular-devel at kde.org
          Reporter: fischer at unix-ag.uni-kl.de
  Target Milestone: ---

I have encountered PDF files that, when being opened in Okular, only show a
large logo from Adobe and the text "For the best experience, open this PDF
portfolio in Acrobat X or Adobe Reader X, or later." and below that a
button-like image labeled "Get Adobe Reader Now!". The button is a link to
Adobe's webpage.
Okluar also notifies in a blue box above that this PDF file contains embedded
files. The embedded files are one or several PDF files that can be viewed or
saved in the list in window "Embedded Files".

So, the technical support for "PDF portfolios" is there as a portfolio seems to
be a regular PDF file only containing a scary image of "don't use third-party
PDF viewers" plus a few attached regular PDF files. However, it is made to
trick users into believing that Okular does not support such portfolios as the
attachment notification is easy to miss in such a situation.

A better way to handle such a situation for Okular would be:
- if it is just one embedded PDF file, then immediately discard the "outer" PDF
with the scary warning and show the embedded one only. Notify about this
redirection via a non-intrusive notification like the one for the embedded
files.
- if several PDF files are embedded, show a concatenated version of the in the
main viewer so that it looks like one PDF file. Still, never show the scary
image, but show the "This document has embedded files" notification to allow
retrieving the embedded PDF files individually.

Example PDF file are easy to find by just searching the Internet for the scary
text message.
One example is: https://www.irs.gov/pub/irs-prior/f7200--2021.pdf
(which is probably legal to use and archive as being a US government document).

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