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The current way of exposing GDK API that should be considered internal to GTK+ is to append a 'libgtk_only' suffix to the function name; this is not really safe. GLib has been using a slightly different approach: a private table of function pointers, and a macro that allows accessing the desired symbol inside that vtable. We can copy the approach, and deprecate the 'libgtk_only' symbols in lieu of outright removal. https://bugzilla.gnome.org/show_bug.cgi?id=739781
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