#242 Key Binding Option for Interactions History Scrolling

[Elspeth Simpson White]

It would be nice to have a key-binding option for the
two ways of scrolling through the interactions history
(currently, up arrow goes up one line, ctrl-up arrow
goes up 1 interactions history item). This way, users
could set the behavior to match their personal preference.

[Dan Smith]

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See bug #1065197, which prompted this RFE.