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* Avoid performance problems with setbufline() and Treesitter Call nvim_buf_set_lines() instead. Since this is a performance problem only in Neovim (Treesitter is only available there), it doesn't matter that this API is unavailable in Vim. Note: nvim_buf_set_lines() returns E5555, when set nomodifiable is on. Fixes #3669 * Avoid sign flickering The signs flickered because nvim_buf_set_lines() removes all signs from lines that it touches, which will immediately be readded by Ale (causing the brief flicker). This is intended behaviour in neovim [0]. Neovim itself faced this problem in their own LSP formatting sync, although they had the problem with marks instead of signs [1]. Similar to how neovim fixed it by storing and restoring the marks [2], we can do the same thing with signs. In fact it is easier with signs, because sign_placelist() will just ignore and skip invalid line numbers, so we don't need to filter signs that are not valid anymore. [0] https://github.com/neovim/neovim/issues/10880#issuecomment-526466042 [1] https://github.com/neovim/neovim/issues/14307 [2] https://github.com/neovim/neovim/pull/14630