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https://bugs.launchpad.net/inkscape/+bug/167247 and a few of its duplicates.
This fix is aimed at preventing any sort of circular references with the URIReference::_acceptObject method, checking the absence of loops in the reference+child tree.
There can be some performance improvements done if we add a pointer from cloned sub-objects to their origin sub-object.
The remaining cases that are not fixed can involve non-trivial loops using one or more "url()" stylesheet references. Being able to take them into account would require a non-obvious style.cpp refactoring making use of URIReference for this kind of reference (and not handling manually the signals in the styling code, which would probably be a good thing to do anyway)
(bzr r14245)
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