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Unexpected shift with push_group and pop_group

Submitted by Stefan Röllin

Assigned to Adrian Johnson @ajohnson

Link to original bug (#22441)

Description

A problem with the pdf cairo backend was found in inkscape, see bug https://bugs.launchpad.net/inkscape/+bug/320646

The attached program reproduces this behaviour. It does basically the following:

draw a circle
cairo_push_group
draw another circle at same place as first
cairo_pop_group_to_source
cairo_paint_with_alpha

One would expect that both circles are shown at the same place, which is not the case. It depends on the page size, whether the second circle is at the correct position or not.

Version: 1.8.6

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