Fix choices out of bounds #9
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The index must be reset to zero. As the element is guaranteed to be inside the match list, we can simply use modulo for that.
At the first element, the index is turned into -1, the modulo operation leaves that alone, and Vim indexing accesses the last element, leading to a correct wrap-around.
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Hi; I hope you don't mind another set of patches; I'm currently re-purposing SwapIt for another use case, and found some more minor issues.