[MacPorts] #52590: keybinder @0.3.0: add a new port/subport keybinder-3.0 @0.3.1 with gtk3 support

[MacPorts]

#52590: keybinder @0.3.0: add a new port/subport keybinder-3.0 @0.3.1 with gtk3
support
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 Reporter:  devans@…     |      Owner:  macports-tickets@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  keybinder-3.0
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 Since keybinder @0.3.0, there has been, in addition to keybinder, a
 separate keybinder-3.0 branch that uses gtk3 with gobject-introspection
 support rather than gtk2. It would be nice to add this to MacPorts either
 as a separate companion port or as a subport of keybinder.

 This enhancement was originally part of #52545 and has been moved to this
 ticket for clarity.

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Ticket URL: <https://trac.macports.org/ticket/52590>
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