[MacPorts] #59718: xxdiff does not X11 forward on MacOS Catalina

[MacPorts]

#59718: xxdiff does not X11 forward on MacOS Catalina
-----------------------+----------------------------
 Reporter:  aedolphin  |      Owner:  (none)
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:  MacPorts 2.7.0
Component:  ports      |    Version:  2.6.2
 Keywords:             |       Port:  xxdiff
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 After upgrading to MacOS Catalina and upgrading to the 2.6.2 MacPorts for
 Catalina, xxdiff no longer forwards correctly across an X11 connection.
 Instead, the xxdiff window pops up on the server instead of the laptop
 from which I logged into the server.  I have verified other X11
 applications (e.g., xemacs, ds9) forward across the X11 connection as
 expected, so this issue is unique to xxdiff (or possibly Qt5, as xxdiff is
 the only Qt-based application I use).

 I understand a work-around is to use remote desktop instead of "ssh -X"
 but it would be preferable if xxdiff could be forwarded.

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Ticket URL: <https://trac.macports.org/ticket/59718>
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