My Neovim LSP error message doesn't have a red color
I am on Windows 10 and use the new Windows Terminal + NeoVim, my config is similar to yours with the same colorscheme. I fixed the color issue by adding this to my 'init.vim' file, before setting the colorscheme:
set termguicolors
The following options were recommended as a solution in different GitHub discussions, but they had no effect for me whatsoever:
let g:gruvbox_contrast_dark = 'hard'
if exists('+termguicolors')
let &t_8f = "\<Esc>[38;2;%lu;%lu;%lum"
let &t_8b = "\<Esc>[48;2;%lu;%lu;%lum"
endif
let g:gruvbox_invert_selection='0'
set background=dark
For future reference, the old answers will probably fail, now there are more organized highlight groups for you to customize the colors of those, for example:
highlight LspDiagnosticsDefaultError guifg=#FF0000
For more detailed information read :help lsp-highlight-diagnostics
and :help highlight
.
Edit: Notice this needs to go after more general colorscheme settings such as colorscheme whatever
that might overwrite your highlight