def meta_enter_message(python_input):
    """
    Create the `Layout` for the 'Meta+Enter` message.
    """
    def get_text_fragments():
        return [('class:accept-message', ' [Meta+Enter] Execute ')]

    def extra_condition():
        " Only show when... "
        b = python_input.default_buffer

        return (
            python_input.show_meta_enter_message and
            (not b.document.is_cursor_at_the_end or
                python_input.accept_input_on_enter is None) and
            '\n' in b.text)

    visible = ~is_done & has_focus(DEFAULT_BUFFER) & Condition(extra_condition)

    return ConditionalContainer(
        content=Window(FormattedTextControl(get_text_fragments)),
        filter=visible)
Create the `Layout` for the 'Meta+Enter` message.