Feature request: Shortcut to open the selected folder (directory) in the opposite pane.

[raindropsfromsky]

Let the user select a folder in the active pane and open that folder in the opposite pane with a shortcut (hotkey).
(The opposite pane should show the content of that selected folder.)

The hotkey could be as simple as ALT+ENTER or ALT+Double click.
I have chosen the ALT key deliberately, as it implies the ALTernative pane (the other pane).