Fix BptreeMap range iter adjacent leaves #120
Merged
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Continuation of #118.
Description for the edge case is in the comment.
I haven't found a way to check if one leaf is ahead of another.
So i took an advantage of the fact that we are advancing leaf iterators one at a time.
I.e. before advancing right/left leaf iterator we check if they are pointing to the same node and if so there is no elements left.