tmux.conf: fix ^z^s

tmux.conf

@@ -1,15 +1,17 @@
 # tmux.conf
 
 if "test -f $HOME/.tmux.conf.local" "source-file $HOME/.tmux.conf.local" \
-       "display-message \"$HOME/.tmux.conf.local not found\""
+    "display-message \"$HOME/.tmux.conf.local not found\""
 
 unbind C-b
 set -g prefix C-z
 bind C-z send-prefix
 bind C-c command-prompt "new-window '%%'"
 bind C-r source-file ~/.tmux.conf \; display-message "Reloaded config !"
-bind C-s command-prompt -p "prompt name:" \
-"new-session -t '%1'; switch-client -t '%1'"
+# new-session: -A: "behaves like attach-session if session-name already exists"
+#              -d: do not attach the created session
+bind C-s command-prompt -p "session name:" \
+    "new-session -Ad -s '%1'\; switch-client -t '%1'"
 
 set -g base-index 1
 set -g pane-base-index 1