- If there are too many tabs opened to fit onto the screen,
the tabs menu can be scrolled
- When tabs menu is opened, scroll to the selected tab
- Use margins instead of padding to that the scrollbar does not
overlap with the cross button
- Make sure that if the tabs menu is long, there will
be a gap between it's top/bottom and the edge of the
screen
- On linux, screen.availTop and screen.availHeight are not always
correct and the menu can go outside of what is supposed to be
the available screen area. Special treatment for those
edge cases
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