Fix usage with Dialog

Author: djhi

packages/ra-ui-materialui/src/input/AutocompleteInput.tsx

@@ -554,6 +554,8 @@ If you provided a React element for the optionText prop, you must also provide t
 
     const handleAutocompleteChange = useCallback(
         (event: any, newValue: any, reason: AutocompleteChangeReason) => {
+            event.stopPropagation();
+            event.preventDefault();
             if (reason === 'createOption') {
                 // When users press the enter key after typing a new value, we can handle it as if they clicked on the create option
                 handleChangeWithCreateSupport(getCreateItem(newValue));