we have a static variable that prevents us from terminating libreoffice
in this case here

With the changes Julien brought in via
66fd9a61, thought it was a good idea
to cover those code paths as well - done now, via the
checkCrossoverSolver() tests.

Previously 'z' did not update the current point to the start
point of the subpath, as required by
http://www.w3.org/TR/SVG/paths.html#PathDataClosePathCommand. Fixed
now, and adapted all the unit tests.