updated changelog and docstring

Author: RenaudLN

CHANGELOG.md

@@ -16,7 +16,7 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 ## Added
 
 - [#2630](https://github.com/plotly/dash/pull/2630) New layout hooks in the renderer
-- [#2647](https://github.com/plotly/dash/pull/2647) `routing_callback_inputs` allowing to pass more State arguments to the pages routing callback
+- [#2647](https://github.com/plotly/dash/pull/2647) `routing_callback_inputs` allowing to pass more Input and/or State arguments to the pages routing callback
 
 
 ## [2.12.1] - 2023-08-16

dash/dash.py

@@ -352,6 +352,7 @@ class Dash:
     add new States to the routing callback, to pass additional data to the layout
     functions. The syntax for this parameter is a dict of State objects:
     `routing_callback_inputs={"language": Input("language", "value")}`
+    NOTE: the keys "pathname_" and "search_" are reserved for internal use.
     """
 
     _plotlyjs_url: str
@@ -2083,14 +2084,16 @@ def router():
                 return
             self._got_first_request["pages"] = True
 
+            inputs = {
+                "pathname_": Input(_ID_LOCATION, "pathname"),
+                "search_": Input(_ID_LOCATION, "search"),
+            }
+            inputs.update(self.routing_callback_inputs)
+
             @self.callback(
                 Output(_ID_CONTENT, "children"),
                 Output(_ID_STORE, "data"),
-                inputs={
-                    "pathname_": Input(_ID_LOCATION, "pathname"),
-                    "search_": Input(_ID_LOCATION, "search"),
-                    **self.routing_callback_inputs,
-                },
+                inputs=inputs,
                 prevent_initial_call=True,
             )
             def update(pathname_, search_, **states):