[MacPorts] #57577: qt4-mac : set the graphicssystem via qtconfig

[MacPorts]

#57577: qt4-mac : set the graphicssystem via qtconfig
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  Reporter:  RJVB         |      Owner:  michaelld
      Type:  enhancement  |     Status:  assigned
  Priority:  Normal       |  Milestone:
 Component:  ports        |    Version:
Resolution:               |   Keywords:  haspatch
      Port:  qt4-mac      |
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Comment (by RJVB):

 Yes, qtconfig will also change the default system font back to what it
 considers the default on your platform (and careful with Qt4 if you use a
 less common font weight like "Medium"). It's always a good idea with that
 tool to check the fonts setting before saving.

 Anyway, it sounds as if maybe you didn't apply the companion patch I
 appended to your PR. Because if your `KApplication` class still forces a
 specific mode you won't see any effect from the setting made in QtConfig
 which is applied at an earlier moment. The absence of effect of picking
 OpenGL mode is telling, so I'm guessing that any other pure Qt4 app will
 be affected in your case, and no KDE4 app.

 If not, than we'll have to figure out why you don't see any effect in KDE4
 apps, which is going to write some KDE4 code (there's no easy API for
 querying the current graphics system).

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Ticket URL: <https://trac.macports.org/ticket/57577#comment:15>
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