Printing with art backend

[Riccardo Mottola]

Hi,

since I was investigating with Fred some problems with printing on cario 
where the image gets clipped and paginated wrong, I wanted to test on 
art, to see if the problem is backend specific or not.

However, as soon as I try to print form Laterna Magica, I do get:

Printing error: <NSException: 0x84762e4> NAME:NSInvalidArgumentException 
REASON:[GSStreamContext-GSDefineGState] not implemented INFO:(null)

Interestingly, printing for example from Graphos and Ink continues to work.

PRICE printing is broken too. Thus it appears that printing an 
NSImageView is broken on art currently.

Riccardo