Handling continuous scroll key input. #33
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Add impulse checking the current velocity value.
Without this patch, keeping pressing scroll key, it doessn't stop
properly. This patch make to set a upper limit to velocity value.
Add a function for distance instead of impluse. It will help to move a
specific lines. But it will ignore the air_drag value. It is hard to
calculate the impulse value to move a certain distance with air_drag.