Retrieves the subtitle of the header. See gtk_header_bar_set_subtitle().
Return: the subtitle of the header, or %NULL if none has been set explicitly. The returned string is owned by the widget and must not be modified or freed.
3.10
See Implementation
Retrieves the subtitle of the header. See gtk_header_bar_set_subtitle().
Return: the subtitle of the header, or %NULL if none has been set explicitly. The returned string is owned by the widget and must not be modified or freed.