patch 8.0.1290: seq_cur of undotree() wrong after undo commit https://github.com/vim/vim/commit/80eaddd3a0bc47cb14168964678420cfe03a2502 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Nov 11 23:37:08 2017 +0100 patch 8.0.1290: seq_cur of undotree() wrong after undo Problem: seq_cur of undotree() wrong after undo. Solution: Get the actual sequence number instead of decrementing the current one. (Ozaki Kiichi, closes #2319)

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