Fix duplicate menu at end of buffer #937
Merged
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This has been bugging me for a while, finally tracked it down. It's most apparent in tmux where the buffer and window size are always the same, but happens reliably at the end of the buffer (#598 back from the dead?).
Before the fix:
![old](https://user-images.githubusercontent.com/1094150/59295286-28ad1600-8c38-11e9-8ddf-d3444fb7fe81.png)
After the fix:
![new](https://user-images.githubusercontent.com/1094150/59295296-2f3b8d80-8c38-11e9-832d-aa1c765d91d5.png)