[MacPorts] #63716: macos12: gtk3-demo-application just shows black frame

[MacPorts]

#63716: macos12: gtk3-demo-application just shows black frame
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 Reporter:  MStraeten     |      Owner:  (none)
     Type:  defect        |     Status:  new
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.7.1
 Keywords:  monterey gtk  |       Port:  gtk3
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 after upgrading from macos11 to macos12 gtk3-demo-application built with
 recent macports using Xcode13 commandline tools and sdk 12 (as well als
 built with Xcode 12.5 and sdk 11.3) just shows a black frame.

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Ticket URL: <https://trac.macports.org/ticket/63716>
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