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ref: 8d5766d417d6564a1aa1cbe8f9a29ab9bba22371 parent: 5c41f41ad4b14e48aea64687a7600f5ad231e879 author: Takayama Fumihiko <tekezo@pqrs.org> date: Thu Apr 23 21:23:32 EDT 2020
Fix IsAncestor and IsDescendant when the same page is passed