patch 8.1.2265: when popup with "botleft" does not fit it flips incorrectly Commit: https://github.com/vim/vim/commit/638a4a7508082f8700b135953e4f9465f675a0f5 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Nov 6 19:25:22 2019 +0100 patch 8.1.2265: when popup with "botleft" does not fit it flips incorrectly Problem: When popup with "botleft" does not fit it flips incorrectly. Solution: Only flip when there is more space on the other side. Add the "posinvert" option to disable flipping and do it in both directions if enabled. (closes #5151)

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