cairo vs. art and PDFKit

[Riccardo Mottola]

Hi,

I noticed that PDFKit (which is used by the PDF inspector in the content 
inspector of GWorkspace) with current cairo doesn't work anymore, it 
displays only blank pages (of the correct size, but no content, no 
graphics, no text). The same plugin run with the art backend (without 
recompiling anything else besides the backend) works again.
Richard Stonehouse cna reproduce this too and Sebastian too.

I wonder what's up and how it can be debugged further.

Riccardo