Make halflayout neighbours more consistent
Previously, it was possible to go down from tile 0 to tile 1, but not up from 1 to 0. Now, don't allow going down from tile 0 (as it's not actually down).
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Previously, it was possible to go down from tile 0 to tile 1, but not up from 1 to 0. Now, don't allow going down from tile 0 (as it's not actually down).