neovim/neovim — pull request #1161 by atwupack (2014-09-11 18:49:14+00:00)
Title: [RFC] vim-patch:7.4.349

Problem: When there are matches to highlight the whole window is redrawn, which is slow.
Solution: Only redraw everything when lines were inserted or deleted. Reset b_mod_xlines when needed. (Alexey Radkov)

https://code.google.com/p/vim/source/detail?r=v7-4-349