API: Don't export gtk_widget_preferred_size_and_baseline()
gtk_widget_preferred_size() is only useful if you want to quickly port a widget from GTK2 sizing code to GTK3 but does not properly work with height-for-width as used in GTK. So we don't want to encourage people to use it. In particular we want people to convert to height-for-width before adding baseline support to their widgets.
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