Hi,

The GTK+ Print dialog by default create a cairo pdf surface regardless 
of printer's ability to handle it.
While PDF is definitely the right direction, however, most printers 
available are still not quite there yet
while print systems is capable of handling PostScript. So the patch 
essentially is to use a PS cairo surface
to print preview instead of PDF.

There is also another good reason to do so is that none of the print 
backends, cups, lpr and papi all uses a
PostScript surface to render print job.

see attached patch.

Thanks,

-Ghee
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