Use _allow_dynamic_callbacks flag to bypass import in callbacks warning.

Author: T4rk1n

dash/_callback.py

@@ -261,6 +261,7 @@ def insert_callback(
         "output": output,
         "raw_inputs": inputs,
         "manager": manager,
+        "allow_dynamic_callbacks": dynamic_creator,
     }
     callback_list.append(callback_spec)
 

dash/dash.py

@@ -1285,7 +1285,6 @@ def long_callback(
     def dispatch(self):
         body = flask.request.get_json()
 
-        app_studio = "app_studio" in ComponentRegistry.registry
         nlibs = len(ComponentRegistry.registry)
 
         g = AttributeDict({})
@@ -1317,6 +1316,7 @@ def dispatch(self):
 
         try:
             cb = self.callback_map[output]
+            _allow_dynamic = cb.get("allow_dynamic_callbacks", False)
             func = cb["callback"]
             g.background_callback_manager = (
                 cb.get("manager") or self._background_manager
@@ -1383,7 +1383,7 @@ def dispatch(self):
             )
         )
 
-        if not app_studio and nlibs != len(ComponentRegistry.registry):
+        if not _allow_dynamic and nlibs != len(ComponentRegistry.registry):
             print(
                 "Warning: component library imported during callback, move to top-level for full support.",
                 file=sys.stderr,