Save PDF with the Highlights

[Cimbali]

Discussed in #315

^{Originally posted by Lazaro10e0 April 10, 2024}
[I would like to] save the PDF with the "Highlight" that I have been writting through the class
[…]

[Cimbali]

It seems Poppler has an annotation type called POLY_LINE which would be what we need, but I don’t see the class inheriting from PopplerAnnotMarkup that implements poly lines. PopplerAnnotLine exists but seems to be only for lines with a start and end point, and no intermediate points…