A small suggestion. Ability to add/remove tabs to islands by dragging the icon + "open new tab" right or left. 
Posts made by Saoromat
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BlogsRE: How to use Tab Islands in Opera Browser
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Opera for computersRE: Mute Icon in Tab
Faced with a similar bug. When the video is active, the cross to close the tab goes to the right, despite the fact that there is enough space for it.
