[Dev-luatex] Fix PDF whatsits

[Marcel Krüger]

Hello,

I attached a little patch to avoid SEGFAULTs when the backend encounters `pdf_annot`, `pdf_start_link`, `pdf_dest` or `pdf_thread` whatsits.
The SEGFAULT was introduced in revision 6738.

I also noticed that there is no backend support for pdf_start_thread nodes, so using `\pdfextension startthread` leads to

! error: (pdf backend): no output function for whatsit pdf_start_thread

Maybe a note about this could be added to the documentation?

Best regards
Marcel KrÃŒger

[Hans Hagen]

Post by Marcel Krüger
Hello,
I attached a little patch to avoid SEGFAULTs when the backend encounters `pdf_annot`, `pdf_start_link`, `pdf_dest` or `pdf_thread` whatsits.
The SEGFAULT was introduced in revision 6738.

hm, indeed this need to be fixed but with another kind of patch. will do

Hans

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