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[inkscape]: do not upgrade to libxml2-2.7.4-1

libxml2-2.7.4-1 which is available on test-update and rawhide seems to be broken preventing Inkscape to run. Should you attempt to dowgrade that package, make sure to downgrade packagekit, setroubleshoot and system-config-printer first, otherwise temporally remove them. Bug report has been submitted and hopefully should be fixed.
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