First off, I apologize. I apologize for this hideously specific bug report and I apologize for what might be a poor title. (Feel free to rename it if you can think of anything better.)

I work with ancient Greek quite a lot. Vim and NeoVim handle it pretty well. Although the rendering of complex words (where complex means "with several diacritics or accents all over one letter") can be ugly (squished, etc.), it works.

I just noticed, however, that a document I'm editing looks different using vimR than using NeoVim in Terminal.app. The problems are visible on line 1025 and below (where the cursor is in both pictures).

vimR:

neovim in Terminal.app:

This may be related to #212 or to #239.

OSX 10.11.6
Terminal.app: Version 2.6.1 (361.1)
neovim: NVIM v0.1.6-105-g6e9f329
Build type: Dev
Compilation: /usr/local/Library/Homebrew/shims/super/clang -Wconversion -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=1 -O2 -g -Wall -Wextra -pedantic -Wno-unused-parameter -Wstrict-prototypes -std=gnu99 -Wvla -fstack-protector-strong -fdiagnostics-color=auto -DINCLUDE_GENERATED_DECLARATIONS -DHAVE_CONFIG_H -I/tmp/neovim-20160916-53343-179mv16/build/config -I/tmp/neovim-20160916-53343-179mv16/src -I/tmp/neovim-20160916-53343-179mv16/deps-build/usr/include -I/tmp/neovim-20160916-53343-179mv16/deps-build/usr/include -I/tmp/neovim-20160916-53343-179mv16/deps-build/usr/include -I/tmp/neovim-20160916-53343-179mv16/deps-build/usr/include -I/tmp/neovim-20160916-53343-179mv16/deps-build/usr/include -I/tmp/neovim-20160916-53343-179mv16/deps-build/usr/include -I/usr/local/opt/gettext/include -I/usr/include -I/usr/include -I/tmp/neovim-20160916-53343-179mv16/build/src/nvim/auto -I/tmp/neovim-20160916-53343-179mv16/build/include
Compiled by [email protected]

Optional features included (+) or not (-): +acl +iconv +jemalloc +tui
For differences from Vim, see :help vim-differences

system vimrc file: "$VIM/sysinit.vim"
fall-back for $VIM: "/usr/local/Cellar/neovim/HEAD-6e9f329/share/nv
vimR: Version 0.9.0-SNAPSHOT-20160915.2238 (75)

Here's the LaTeX file in question: https://gist.github.com/734ac38e99a7acb73e968cd1158c03f7.

Please let me know if any other information would help.