fix: show AppBar when Tabs are the only children

solara/components/applayout.py

@@ -257,7 +257,19 @@ def AppLayout(
         use_drawer = True
     title = t.use_title_get() or title
     children_appbartitle = apptitle_portal.use_portal()
-    show_app_bar = (title and (len(routes) > 1 and navigation)) or children_appbar or use_drawer or children_appbartitle
+    v_slots = []
+    # Separate tabs from the other children. We want to keep a reference to any tabs that were added through children
+    # so we can make sure AppBar is rendered even when tabs are the only children
+    tabs = None
+    for child_appbar in children_appbar.copy():
+        if child_appbar.component == solara.lab.Tabs:
+            if tabs is not None:
+                raise ValueError("Only one Tabs component is allowed in the AppBar")
+            tabs = child_appbar
+            children_appbar.remove(tabs)
+    tabs_to_render = tabs
+
+    show_app_bar = (title and (len(routes) > 1 and navigation)) or bool(children_appbar) or bool(use_drawer) or bool(children_appbartitle) or bool(tabs)
 
     if style is None:
         style = {"height": "100%", "max-height": "100%", "overflow": "auto"}
@@ -269,27 +281,17 @@ def set_path(index):
         path = paths[index]
         location.pathname = path
 
-    v_slots = []
-
-    tabs = None
-    for child_appbar in children_appbar.copy():
-        if child_appbar.component == solara.lab.Tabs:
-            if tabs is not None:
-                raise ValueError("Only one Tabs component is allowed in the AppBar")
-            tabs = child_appbar
-            children_appbar.remove(tabs)
-
-    if (tabs is None) and routes and navigation and (len(routes) > 1):
-        with solara.lab.Tabs(value=index, on_value=set_path, align="center") as tabs:
+    if (tabs_to_render is None) and routes and navigation and (len(routes) > 1):
+        with solara.lab.Tabs(value=index, on_value=set_path, align="center") as tabs_to_render:
             for route in routes:
                 name = route.path if route.path != "/" else "Home"
                 solara.lab.Tab(name)
         # with v.Tabs(v_model=index, on_v_model=set_path, centered=True) as tabs:
         #     for route in routes:
         #         name = route.path if route.path != "/" else "Home"
         #         v.Tab(children=[name])
-    if tabs is not None:
-        v_slots = [{"name": "extension", "children": tabs}]
+    if tabs_to_render is not None and navigation:
+        v_slots = [{"name": "extension", "children": tabs_to_render}]
     if embedded_mode and not fullscreen:
         # this version doesn't need to run fullscreen
         # also ideal in jupyter notebooks