fix: wrong color shown when using color_overrides

[jerboa88]

Fix for #657 (Wrong color shown when using color_overrides in Kitty).

Rewrote this section of code to increment or decrement just the blue channel instead of treating color as a single number.

[mrtnvgr]

This does not work for me

-- DO NOT change the paths and don't remove the colorscheme
local root = vim.fn.fnamemodify("./.repro", ":p")

-- set stdpaths to use .repro
for _, name in ipairs({ "config", "data", "state", "cache" }) do
	vim.env[("XDG_%s_HOME"):format(name:upper())] = root .. "/" .. name
end

-- bootstrap lazy
local lazypath = root .. "/plugins/lazy.nvim"
if not vim.loop.fs_stat(lazypath) then
	vim.fn.system({ "git", "clone", "--filter=blob:none", "https://github.com/folke/lazy.nvim.git", lazypath })
end
vim.opt.runtimepath:prepend(lazypath)

-- install plugins
local plugins = {
	{
		"jerboa88/catppuccin-nvim",
		branch = "wrong-color-shown-when-using-color_overrides",
		name = "catppuccin",
		opts = {
			color_overrides = {
				all = {
					text = "#dedeff", -- This will displayed incorrectly as #dede00
					-- text = "#dedefe", -- This will displayed correctly as #dedefe
				}
			}
		},
	},
}
require("lazy").setup(plugins, {
	root = root .. "/plugins",
})

vim.cmd.colorscheme("catppuccin")
-- add anything else here

[jerboa88]

@mrtnvgr I think lazy is still using a cached version of catppuccin/nvim in your case.

After running repro.lua from #657, I had to delete the .repro directory so that lazy.nvim will pull it again from my repo. After that, running nvim -u repro.lua with your repro.lua works as expected.

[nullchilly]

I use github cli and testing this PR is as simple as gh pr checkout 658 inside catppuccin git folder

	#dedefe	#dedeff
Before
After

Thanks for the PR!