This should make True Color (24-bit) and italics work in your tmux session and vim/neovim when using Alacritty (and should be compatible with any other terminal emulator, including Kitty).
Running this script should look the same in tmux as without.
curl -s https://gist.githubusercontent.com/lifepillar/09a44b8cf0f9397465614e622979107f/raw/24-bit-color.sh >24-bit-color.sh
| # vim: set ft=python: | |
| # see the README at https://gist.github.com/phiresky/4bfcfbbd05b3c2ed8645 | |
| # source: https://github.com/mpv-player/mpv/issues/2149 | |
| # source: https://github.com/mpv-player/mpv/issues/566 | |
| # source: https://github.com/haasn/gentoo-conf/blob/nanodesu/home/nand/.mpv/filters/mvtools.vpy | |
| import vapoursynth | |
| core = vapoursynth.get_core() |