Switch from React/JSX to Python for constructing nav() markup

Author: cpsievert

shiny/examples/nav/app.py

@@ -1,4 +1,4 @@
-from typing import List
+from typing import List, Union
 
 from shiny import *
 from shiny.types import NavsArg

shiny/ui/_navs.py

@@ -284,6 +284,7 @@ def menu_string_as_nav(x: Union[str, NavsArg]) -> NavsArg:
 
     return Nav(nav=nav, content=None)
 
+    return Nav(nav=tags.li(class_="bslib-nav-spacer"), content=None)
 
 def nav_menu(
     title: TagChildArg,
@@ -344,7 +345,6 @@ def nav_menu(
         align=align,
     )
 
-
 # -----------------------------------------------------------------------------
 # Navigation containers
 # -----------------------------------------------------------------------------