[MacPorts] #51052: gtk3 @3.20.2 +quartz build error on Mac OS X 10.7

[MacPorts]

#51052: gtk3 @3.20.2 +quartz build error on Mac OS X 10.7
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  Reporter:  martijn@…  |      Owner:  devans@…
      Type:  defect     |     Status:  assigned
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  gtk3       |
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Comment (by friedrich.beckmann@…):

 Replying to [comment:12 mojca@…]:
 > The problem is that Lion "fully supports" all those gestures and almost
 all the apps I use do. I would be motivated to spend some time getting it
 right. Maybe some of the functions were only added in 10.8. There is
 certainly a way to get it working on 10.7, but I need more time (or more
 experience or some helping hand to lead me a bit).

 The problem is in my view the handling of gesture events in gtk. gtk
 expects to have a sequence of events in different phases like START,
 CHANGE, CHANGE, ..., CHANGE, END. This is on the gdk level. In wayland
 this event sequence is produced by the libinput library (I think). See
 https://wayland.freedesktop.org/libinput/doc/latest/gestures.html

 However on MacOS the gestures were introduced without this phase idea
 firsthand. So you could get a single event telling you a Magnify or Rotate
 event. I had to use the phase information provided by the events to
 produce also the gdk required sequence of events. This phase concept was
 introduced later as we see.

 Friedrich

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Ticket URL: <https://trac.macports.org/ticket/51052#comment:14>
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