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Prevents an Xlib warning on Xnest, or Xorg with xinerama, or other non-RANDR-capable xserver. Reintroduce a have_randr12 field in GdkDisplayX11 to avoid having to call XRRQuery{Extension,Version} twice, and don't select randr 1.2 events if that's false. https://bugzilla.gnome.org/show_bug.cgi?id=634711 Signed-off-by: Julien Cristau <jcristau@debian.org>
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