commit https://github.com/vim/vim/commit/3848e00e0177abdb31bc600234967863ec487233 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Mar 19 18:42:29 2016 +0100 patch 7.4.1604 Problem: Although emoji characters are ambiguous width, best is to treat them as full width. Solution: Update the Unicode character tables. Add the 'emoji' options. (Yasuhiro Matsumoto)

--- a/runtime/optwin.vim
+++ b/runtime/optwin.vim
@@ -1254,6 +1254,8 @@ if has("multi_byte")
   endif
   call append("$", "ambiwidth\twidth of ambiguous width characters")
   call <SID>OptionG("ambw", &ambw)
+  call append("$", "emoji\temoji characters are full width")
+  call <SID>BinOptionG("emo", &emo)
 endif