patch 8.2.1976: cannot backspace in prompt buffer after using cursor-left Commit: https://github.com/vim/vim/commit/6f6244855fbce5aaa718cd5001a29aac3c5c15d6 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Nov 11 20:52:40 2020 +0100 patch 8.2.1976: cannot backspace in prompt buffer after using cursor-left Problem: Cannot backspace in prompt buffer after using cursor-left. (Maxim Kim) Solution: Ignore "arrow_used" in a prompt buffer. (closes #7281)

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