Fix unordered background callback inputs & state.

dash/_callback.py

@@ -362,7 +362,7 @@ def add_context(*args, **kwargs):
                     job = callback_manager.call_job_fn(
                         cache_key,
                         job_fn,
-                        args,
+                        func_args if func_args else func_kwargs,
                         AttributeDict(
                             args_grouping=callback_ctx.args_grouping,
                             using_args_grouping=callback_ctx.using_args_grouping,

tests/integration/long_callback/app_unordered.py

@@ -0,0 +1,31 @@
+from dash import Dash, Input, Output, dcc, State, html, callback
+
+from tests.integration.long_callback.utils import get_long_callback_manager
+
+long_callback_manager = get_long_callback_manager()
+handle = long_callback_manager.handle
+
+app = Dash(__name__, long_callback_manager=long_callback_manager)
+
+app.layout = html.Div(
+    [
+        html.Div(id="output"),
+        html.Button("click", id="click"),
+        dcc.Store(data="stored", id="stored"),
+    ]
+)
+
+
+@callback(
+    Output("output", "children"),
+    State("stored", "data"),
+    Input("click", "n_clicks"),
+    background=True,
+    prevent_initial_call=True,
+)
+def update_output(stored, n_clicks):
+    return stored
+
+
+if __name__ == "__main__":
+    app.run_server(debug=True)

tests/integration/long_callback/test_basic_long_callback.py

@@ -523,3 +523,11 @@ def test_lcbc012_long_callback_ctx(dash_duo, manager):
         output = json.loads(dash_duo.find_element("#result").text)
 
         assert output["triggered"]["index"] == 0
+
+
+def test_lcbc013_unordered_state_input(dash_duo, manager):
+    with setup_long_callback_app(manager, "app_unordered") as app:
+        dash_duo.start_server(app)
+        dash_duo.find_element("#click").click()
+
+        dash_duo.wait_for_text_to_equal("#output", "stored")