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由 Paolo Priotto 提交于
when nesting Sortable's, we're not interested in this error: "HierarchyRequestError: Failed to execute 'appendChild' on 'Node': The new child element contains the parent."
e51dc539
when nesting Sortable's, we're not interested in this error: "HierarchyRequestError: Failed to execute 'appendChild' on 'Node': The new child element contains the parent."