commit https://github.com/vim/vim/commit/8b877ac38e96424a08a8b8eb713ef4b3cf0064be Author: Bram Moolenaar <Bram@vim.org> Date: Mon Mar 28 19:16:20 2016 +0200 patch 7.4.1669 Problem: When writing buffer lines to a pipe Vim may block. Solution: Avoid blocking, write more lines later.

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# Test for vi) with cpo-M #2
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