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I'm not sure anymore. pdf/text files still move because internally the don't honor "Shrink to fit".
Some users apparently don't like the panning so I guess it should be made optional.
Many thanks for adding this feature. I just tried it out now and it works exactly like I wished .
But I think there is something wrong with MDBU from floating preview; the vertical panning is extremely fast and not having the smooth motion which it has when using MDBU on icon.