patch 8.0.0484: :lhelpgrep does not fail after a successful one commit https://github.com/vim/vim/commit/ee85df37634dfb0c40ae5de0b4f246aef460b392 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Mar 19 14:19:50 2017 +0100 patch 8.0.0484: :lhelpgrep does not fail after a successful one Problem: Using :lhelpgrep with an argument that should fail does not produce an error if the previous :helpgrep worked. Solution: Use another way to detect that autocommands made the quickfix info invalid. (Yegappan Lakshmanan)