[okular] [Bug 426682] New: CSS support in the Markdown backend

[Sasha Unspecified]

https://bugs.kde.org/show_bug.cgi?id=426682

            Bug ID: 426682
           Summary: CSS support in the Markdown backend
           Product: okular
           Version: 1.9.3
          Platform: Ubuntu Packages
                OS: Linux
            Status: REPORTED
          Severity: wishlist
          Priority: NOR
         Component: general
          Assignee: okular-devel at kde.org
          Reporter: sasha2048 at gmail.com
  Target Milestone: ---

SUMMARY
The Markdown Library (mkd_functions,
https://manpages.debian.org/stretch/libmarkdown2-dev/mkd-functions.3.en.html)
supports extracting the CSS sections from a markdown document via mkd_css. The
Markdown Backend for Okular doesn't use that function. It should.

STEPS TO REPRODUCE
1. Create a markdown document with a stylesheet, e.g. “<style type="text/css">*
{color: red !important}</style> Hello”.
2. Open the markdown document with Okular.

OBSERVED RESULT
Stylesheet is ignored.

EXPECTED RESULT
Stylesheet is taken into account.

SOFTWARE/OS VERSIONS
Operating System: Kubuntu 20.04
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.68.0
Qt Version: 5.12.8 (built against 5.12.8)
Kernel Version: 5.4.0-47-generic
OS Type: 64-bit

ADDITIONAL INFORMATION
Additionally it would be good for the configuration window of the Markdown
backend to allow to specifying custom/user CSS (via a multiline textbox) to be
included into EVERY document (see also #400529, where another user asks to have
not a single textbox but a set of editable stylesheets).

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