Draft: Fancy PDF signatures

Martin BTS requested to merge martinbts/okular:martin/pretty_signatures into master

I extended Okular's capabilities to digitally sign PDFs with a corresponding signature annotation widget. During the signing workflow, users may provide addtional information as illustrated by this screenshot:


The resulting signatures have:

  • calculated font sizes based on the size of the selected signature area
  • a background image as selected in the dialog
  • additional optional information in the signature based on what users enter into the dialog

This requires changes to poppler, as suggested in https://gitlab.freedesktop.org/poppler/poppler/-/merge_requests/1029

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