[Bug 1817033] Re: Unable to correctly print PDF file: Error: Ignoring spurious ET operator.

[Tobias Hoffmann via ubuntu-bugs]

When pdftocairo ist used with libcairo2-1.15.12-1 -- which (AFAIK)
contains the bug I linked above -- to output a pdf file (as pdftopdf
1.21 will do!), it would be no surprise have a corrupt pdf after
pdftocairo, which gs then rightly will complain about; esp. the ET
-thing is the one things such a buggy libcairo2 will produce.

The only thing form-flattening has to do with it, is that pdftopdf 1.21
would only call pdftocairo when a form is present in the pdf.

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Title:
  Unable to correctly print PDF file: Error: Ignoring spurious ET
  operator.

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[Bug 1817033] Re: Unable to correctly print PDF file: Error: Ignoring spurious ET operator.

[Tobias Hoffmann via ubuntu-bugs]

My observations:
As changing pdftops-renderer does not seem to make a difference, probably only 
one of the programs is installed and thus used in all cases?

According to Dependencies.txt, libcairo2-1.15.12-1 seems to installed, which 
AFAIK is affected by the problem described e.g. here: 
https://github.com/Kozea/WeasyPrint/issues/705
I have no explanation though, how the pdf (which, by itself, does not seem to 
contain the error, AFAIAC) would run through the cairo pdf backend ... 

It does not really seem form-related, but there are some options to change the 
form-flattening engines (Till?)
 - or could it possibly be that the 1.21 cups-filter uses some pdf-to-pdf form 
flattening which uses the cairo backend ?


** Bug watch added: github.com/Kozea/WeasyPrint/issues #705
   https://github.com/Kozea/WeasyPrint/issues/705

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Title:
  Unable to correctly print PDF file: Error: Ignoring spurious ET
  operator.

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