[MlMt] Scroll by lines instead of pages?

[Kai Großjohann]

I use the Gmail bindings plus my own add-on bindings.

When in the message list, I can use the space key to scroll the message 
one page down, and Shift-Space to scroll it one page up.

I'd like to bind keys that scroll the message one line down or up.

I found keyboard selectors `scrollPageUp:` and `scrollPageDown:` but I 
couldn't find anything for lines.

Ideas?

Kai
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