fix undercurls in tmux

.config/tmux/tmux.conf

@@ -1,7 +1,6 @@
 yank="xsel -i --clipboard"
 
 # GENERAL SETTINGS
-set -g default-terminal "screen-256color"
 set -g history-limit 20000
 set -g buffer-limit 20
 set -sg escape-time 0
@@ -19,6 +18,10 @@ setw -g mode-keys vi
 set -g visual-activity on
 set -g destroy-unattached on
 
+# Undercurl compatibility
+set -as terminal-overrides ',*:Smulx=\E[4::%p1%dm'
+set -as terminal-overrides ',*:Setulc=\E[58::2::%p1%{65536}%/%d::%p1%{256}%/%{255}%&%d::%p1%{255}%&%d%;m'
+
 # STATUS BAR SETTINGS
 black="color0"
 red="color1"

.config/zsh/.zshrc

@@ -1,5 +1,5 @@
 # vim: set ft=sh:
-# [ -z "$TMUX" ] && exec tmux
+[ -z "$TMUX" ] && exec tmux
 
 source $ZDOTDIR/configs/vars
 source $ZDOTDIR/configs/widgets