Fix unsafe manipulation of parent's children from child
Fix unsafe manipulation of parent's children from child

peppy/osu-new,NeoAdonis/osu,ppy/osu,UselessToucan/osu,smoogipooo/osu,NeoAdonis/osu,ppy/osu,smoogipoo/osu,smoogipoo/osu,UselessToucan/osu,peppy/osu,NeoAdonis/osu,ppy/osu,UselessToucan/osu,smoogipoo/osu,peppy/osu,peppy/osu