[MacPorts] #52400: Update gimp ports to use webkit2-gtk

[MacPorts]

#52400: Update gimp ports to use webkit2-gtk
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  Reporter:  jeremyhu@…               |      Owner:  devans@…
      Type:  defect                   |     Status:  new
  Priority:  Normal                   |  Milestone:
 Component:  ports                    |    Version:  2.3.4
Resolution:                           |   Keywords:  removal
      Port:  gimp2 gimp2-devel gimp3  |
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Comment (by devans@…):

 gimp2 and gimp2-devel are based on gtk2 and could not be ported to
 webkit2-gtk without porting to gtk3 first. There is an upstream git branch
 that is working on the gtk3 update targeting a gimp 3.0 release some time
 in the future.  gimp3-devel is a port of this branch which currently uses
 webkit-gtk3.  But looks like gtk3 support is a ways off yet.

 The good news is that webkit-gtk is only used to implement a help browser
 which can be disabled using --without-webkit.  The help browser is
 conditionally built based on the variant +help_browser.  If webkit-gtk is
 removed, the easiest solution is to just remove this variant from the
 ports.  Without the help browser enabled, the gimp ports use an external
 web browser to display online html docs so nothing lost really.

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Ticket URL: <https://trac.macports.org/ticket/52400#comment:2>
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