Don't let alacritty claim it is xterm

.config/alacritty/alacritty.yml

@@ -1,7 +1,7 @@
-env:
-  # For better compatibility.
-  # <https://github.com/alacritty/alacritty/issues/2049>
-  TERM: xterm-256color
+# env:
+#   # For better compatibility.
+#   # <https://github.com/alacritty/alacritty/issues/2049>
+#   TERM: xterm-256color
 
 font:
   normal:

.tmux.conf

@@ -18,6 +18,7 @@ set -g default-command "exec /bin/zsh"
 
 # Enable Truecolor
 set-option -ga terminal-overrides ",xterm*:RGB:Tc,rxvt-unicode*:RGB:Tc"
+set -ga terminal-features ",alacritty*:RGB"
 set -g default-terminal "tmux-256color"
 
 # Make M-<up> and so on work in Emacs.