trunk: clipped groups lose clipping in cairo-based exports (rev >= 12544)

[su_v]

Steps to reproduce:
1) launch current trunk (default prefs, default new doc, not localized)
2) draw a rectangle
3) draw an ellipse, partially overlapping the rectangle
4) select all and group them
5) draw a star on top
6) select all and set clip
7) save a copy as PDF (or Cairo PNG, PS, EPS)

Expected result:
The content of the PDF (or PNG, PS, EPS) file is visually identical to the original SVG file as rendered in Inkscape on-canvas

Actual result:
The group loses the clipping on export and is rendered fully visible (i.e. unclipped).

Testing on OS X 10.7.5, with latest cairo 1.12.16:
- not reproduced with 0.48.x r9987
- not reproduced with 0.48+devel rev <= 12543
- reproduced with 0.48+devel rev >= 12544

Likely the regression was introduced with the patch for bug #523285 in revision 12544:
<http://bazaar.launchpad.net/~inkscape.dev/inkscape/trunk/revision/12544>

[su_v (suv-lp)]

Sample SVG file

[su_v (suv-lp)]

Copy saved as PDF

[jazzynico (jazzynico)]

Confirmed on Windows XP, Inkscape trunk revision 12832 (not reproduced with 12511).

[Guillermo Espertino (Gez) (gespertino-gmail)]

I propose to promote the importance of this bug report to high at least. It makes it impossible to export complex artworks properly, and that's a deal-breaker for any artist (specially now that Cairo export is the only way to go).

[Tavmjong Bah (tavmjong-free)]

Fixed in r12935 by reverting r12544. #522285 is not a bug.