Same line diffs are hard to make of

[bitigchi]

Hello,

Please see below screenshot:

The diff part could use a little more background highlighting IMO. It might be my iTerm, I'm not sure as well.

[lunacookies]

It looks like you aren’t running with True Colour. Can you try running set termguicolors?

[bitigchi]

It all went grey after set termguicolors.

[lunacookies]

It all went grey after set termguicolors.

Sounds like your environment does not support True Color. Can you try with a new iTerm profile without tmux or anything like that, with the terminal type set to xterm-256color (change that from iTerm > Preferences… > Profiles > > Terminal > Terminal Emulation > Report terminal type), with an up-to-date Vim with only this in the config:

filetype plugin indent on
syntax enable

set termguicolors
colorscheme xcodedark

Can you also make sure that you don’t have anything like export TERM=xyz in your shell configuration, because the terminal emulator is meant to do that itself and might mess it up.

[bitigchi]

Well, this is weird, because my terminal is/was already set to 256 colours. iTerm2 settings are fine, and this was my .vimrc regarding colour and syntax. I tried with a new profile and the results were the same.

if &t_Co > 1
	syntax enable
endif
colorscheme xcodedark
set t_Co=256

Do you get a different highlighting with a same line diff?

[lunacookies]

Here is what diffing looks like with True Colour working properly:

This is what the same text looks like with True Colour disabled:

[lunacookies]

set t_Co=256

This is a Bad Idea because it forces Vim to use the limited 256-colour palette rather than something else. Vim works out what colour palette it has available automatically and makes use of it. Did you remove this line during testing?

[lunacookies]

Just for purposes of demonstration, here is the famous Solarized colourscheme with True Colour:

and here it is without:

Screenshots from solarized8.

[bitigchi]

Alright, I tried some stuff:

This is without termguicolors, left tmux, right iTerm2 (xterm-256)

This is with termguicolors, left tmux, right iTerm2 (xterm-256)

I'm sorry this is turning into something other than diff highlighting. :)

[bitigchi]

Okay, update. This one worked, and the colours are much more beautiful now. I can get proper orange line highlighting in iTerm2, but not in tmux, I'm gonna poke that a little bit more now! Closing, and thanks for the assistance. Nice!

Edit: After an iTerm restart, tmux works fine too!

[lunacookies]

tmux works fine too!

Glad you managed to get it working in your preferred environment!