Multi line block up down event

Originally, when user presses uparrow in a multi line block, the focus moved to the block immediately above it, regardless of where the cursor was.

If user press the uparrow on the top line of the block, the focus moves to the block above, otherwise the cursor moves one line up.

Downarrow is the same way. If user presses downarrow on the bottom line, the focus moves to the block below, otherwise the cursor moves down one line.