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This PR contains a couple of small follow-ups to PR #5971.
Currently
PDFLinkService
requires access to aPDFHistory
instance in order for it to work correctly (and to avoid errors). If we wantPDFLinkService
to be more useful in custom viewers, I don't think that we actually want to force it to have aPDFHistory
instance.Hence this patch, which contains a very simply approach to make
PDFHistory
optional.Edit: Even simpler reviewing with https://github.com/mozilla/pdf.js/pull/6063/files?w=1.