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I use Opera Next 20 (Ver. 20.0.1387.59). Opera Next open new window on full screen mode of OSX, Gray line appear under the address bar. I think this bug existed on Opera Next old version,too.
screenshot → http://photozou.jp/photo/show/124201/199857851
Hey, we are aware of this, should be fixed in Developer stream now.
This problem was solved on Opera Next 21. Thanks!