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Reported by @poire-z, cf. https://github.com/koreader/koreader/pull/4640#issuecomment-466544922 Apparently it's natural for me to make the second swipe slightly longer than the first, so I never noticed a logic issue. I did notice that it seemed slightly harder to make 4-swipe multiswipes than I expected it to be, but those are not necessarily easy gestures to make. The problem was that I needed to prevent obviously silly gestures like west west west east. In ignoring such duplication, what I accidentally did was to ignore any further movement west after the first multiswipe direction was detected, meaning that the following swipe east could still end up as a relatively western movement overall. By simply updating the current multiswipe slot in case of the same direction, both problems are prevented. We'll never get the same direction twice, and X moves over to where it's supposed to be on the left.