I think having the left-side version is better also for the reason that has been slightly hinted here; it's faster to read a text that spans over a more squareshaped area than a pulled out rectangular one. You just don't have to move your eyes as much. A teacher back in high school taught us how to read normal books fast by holding them slightly more further away and then focusing the view in the center of the line and just moving it down, without moving it sideways. Not that I really mastered that. :-P
Kind of makes you wonder if this isn't (or should be) a per-user setting in the forum.
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