Undercurl does not work inside Tmux and Neovim

[FahimAnayet]

Undercurl does work in bare terminal, however it doesn't work inside tmux and neovim.

Tmux config (I've tried commented lines too)

Bare rio

Tmux

Tmux+Neovim (same in outside tmux+neovim)

[raphamorim]

Thank you for the issue! I will try to reproduce it 👍

[FahimAnayet]

With these settings undercurl works perfectly now. I'm closing the issue as it is complete 😄

tmux

set -g default-terminal xterm-256color
set-option -ga terminal-overrides ",xterm*:Tc"

neovim

vim.cmd([[hi! DiagnosticUnderlineHint gui=undercurl, cterm=undercurl]])
vim.cmd([[hi! DiagnosticUnderlineInfo gui=undercurl, cterm=undercurl]])
vim.cmd([[hi! DiagnosticUnderlineError gui=undercurl, cterm=undercurl, guisp=red]])
vim.cmd([[hi! DiagnosticUnderlineWarn gui=undercurl, cterm=undercurl, guisp=orange]])

[raphamorim]

Wow great finding @FahimAnayet Thank you for investigating and sharing