Avoid collision when add_new_at is nil #411
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Rename `add_to_list_top` and `add_to_list_bottom` private methods to `avoid_collision` that handles both cases as well as the case where `:add_new_at` is `nil`. Setting an explicit position when `:add_new_at` is `nil` will now shuffle other items out of the way if necessary.
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Rename
add_to_list_topandadd_to_list_bottomprivate methods toavoid_collisionthat handles both cases as well as the case where:add_new_atisnil. Setting an explicit position when:add_new_atisnilwill now shuffle other items out of the way if necessary.Fixes #410