Handle shell history per-pane when TMUX is active

.zshrc

@@ -104,6 +104,14 @@ if [ -z "${SUDO_USER}" ] && [ -z "${SSH_CONNECTION}" ] && [ -z "${TERM_PROGRAM}"
   tmux new -A -s local_tmux
 fi
 
+# Use a history file per-pane in tmux
+if [ -n "$TMUX_PANE" ]; then
+  hist_dir="${XDG_STATE_HOME:-${HOME}/.local/state}/zsh"
+  [ -d "$hist_dir" ] || mkdir -p "$hist_dir"
+  export HISTFILE="${hist_dir}/histfile.$TMUX_PANE"
+  setopt inc_append_history
+fi
+
 # Define a function to use autossh with a custom bashrc
 function assh() {
   remote_file=$(mktemp)