Add [ALT]+[UP] shortcut in "Bookmark manager" to navigate to the parent folder.

[LovelyMonkey]

Currently [ALT]+[LEFT] returns to the previous Bookmark folder. That's great.

It would be amazing if [ALT]+[UP] could be implemented to navigate to the parent folder (the same way this shortcut is present on most file explorers).

Thanks and have a nice day!

[Jon]

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