Added forbidden_option_attrs

Author: Roopa

click_option_group/_core.py

@@ -360,6 +360,10 @@ class AllOptionGroup(OptionGroup):
     - All options from the group must be set or None must be set.
     """
 
+    @property
+    def forbidden_option_attrs(self) -> ty.List[str]:
+        return ['required', 'hidden']
+
     @property
     def name_extra(self) -> ty.List[str]:
         return super().name_extra + ['all_or_none']