Allow creating new OS windows in session files

Fixes #1514

docs/changelog.rst

@@ -24,6 +24,8 @@ To update |kitty|, :doc:`follow the instructions <binary>`.
   multi-character ligatures under the cursor to make editing easier
   (:iss:`461`)
 
+- Allow creating new OS windows in session files (:iss:`1514`)
+
 - Allow specifying a value of ``none`` for the :opt:`selection_foreground`
   which will cause kitty to not change text color in selections (:iss:`1358`)
 

docs/index.rst

@@ -342,6 +342,10 @@ For example:
     # Set the current layout
     layout stack
     launch zsh
+
+    # Create a new OS window
+    new_os_window
+    launch sh
     # Make the current window the active (focused) window
     focus
     launch emacs