Fix colors in tmux

tmux/tmux.conf

@@ -1,5 +1,7 @@
 set -g default-command "${SHELL}"
-set -g default-terminal "xterm-256color"
+# This *has* to be set to something with `screen-`, do not set this bindly
+# to $TERM, e.g. "alacritty"!
+set -g default-terminal "screen-256color"
 
 set -g set-titles on
 set -g set-titles-string '#S'
@@ -38,6 +40,9 @@ set-window-option -g pane-base-index 1
 set -g status-position bottom
 set -g status-justify left
 
+# https://wiki.archlinux.org/title/tmux#256_colors
+set -ga terminal-overrides ",alacritty:Tc"
+
 setw -g pane-border-status bottom
 setw -g pane-border-format ''