[Bug 1551949]

[Jonathan Watt]

I got a question on chat about using SkiaPDF instead of cairo for this
and I might as well add what info I have here.

SkiaPDF does indeed [have functionality to
annotate](https://github.com/google/skia/blob/c0bd9f9fe533a7b8644392240c1250195aaee537/include/core/SkAnnotation.h)
the PDFs in generates. However, although we use Skia, we [only made an
experimental start on integrating and using
SkiaPDF](https://mzl.la/3iZiU7v) as a printing backend. Finishing that
off is probably still a fair amount of work. For anyone looking into
fixing this bug the expedient way forward is most likely to try porting
the functionality from a newer version of cairo to our old, in-tree
version, as suggested by Jeff in comment 20.

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https://bugs.launchpad.net/bugs/1551949

Title:
  Printing to PDF file loses URLs/links

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