[MacPorts] #58280: Black screen on GTK2 +quartz ports

[MacPorts]

#58280: Black screen on GTK2 +quartz ports
--------------------+--------------------
 Reporter:  slavad  |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:
 Keywords:          |       Port:  gtk2
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 Main window for some GTK2 +quartz apps is black. See the screenshots for
 Inkscape and Dia

 Originally these apps were installed as +x11 variants, I reinstalled all
 deps in the +quartz variant and then installed these apps in the +quartz
 variant. Maybe I missed some library?

 macOS 10.14.4

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Ticket URL: <https://trac.macports.org/ticket/58280>
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