[MacPorts] #27990: Split GTK2 support to gtk2-x11 and gtk2-quartz

[MacPorts]

#27990: Split GTK2 support to gtk2-x11 and gtk2-quartz
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 Reporter:  bgrupe@…          |       Owner:  macports-tickets@…                   
     Type:  enhancement       |      Status:  new                                  
 Priority:  Normal            |   Milestone:                                       
Component:  ports             |     Version:  1.9.2                                
 Keywords:                    |        Port:  gtk2                                 
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 Hi,

 since there are many problems with gtk2 +quartz (e.g. #19705 #27923 and
 some unreported ones) I'd like to propose to split the port (and some of
 its dependencies like pango and cairo) into a gtk2-x11 and a gtk2-quartz
 port.

 Ports depending explicitly on an X11 gtk/gdk could then just require it
 and you could have installed both versions. When choosing "+quartz" on a
 port like gimp where it works, gtk2-quartz should be selected
 automatically.

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Ticket URL: <https://trac.macports.org/ticket/27990>
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