proposing cherry-picking of http://cgit.freedesktop.org/libreoffice/core/commit/?id=5e4c9fb9bbf12b40afbefb30e8d71d6e046b5bd0 back to 3-4. We bundle migrationoo3 into our install sets, but it's not registered. I strongly suspect it's the trigger for fdo#37195 C.