no new-session and respect focus events

tmux/.tmux.conf

@@ -1,13 +1,13 @@
-new-session
-setw -g aggressive-resize 1
+set -g aggressive-resize 1
 set -g base-index 1
-setw -g pane-base-index 1
-setw -g clock-mode-style 24
+set -g pane-base-index 1
+set -g clock-mode-style 24
 
 set -g default-terminal 'xterm-256color'
 set -s escape-time 0
 set -g history-limit 10000
 
+set -g focus-events on
 set -g mouse on
 set -g renumber-windows on
 set -g set-titles on