tmux: Bind <C-o> to focus last-window

.config/tmux/tmux.conf

@@ -79,6 +79,9 @@ bind -r C-n next
 bind -r   p prev
 bind -r C-p prev
 
+# Jump back to last focused window
+bind C-o last-window
+
 # Swap window with previous/next one
 bind -r N swap-window -d -t :+1
 bind -r P swap-window -d -t :-1