[MacPorts] #54539: qt5 @5.8.0.0 application crashing

[MacPorts]

#54539: qt5 @5.8.0.0 application crashing
-----------------------+-----------------
 Reporter:  keybounce  |      Owner:
     Type:  defect     |     Status:  new
 Priority:  Normal     |  Milestone:
Component:  ports      |    Version:
 Keywords:             |       Port:  qt5
-----------------------+-----------------
 An aaplication (OBS) using Qt5 is crashing.

 Specifically, OBS 19 dies, OBS 18 works.

 ```
 Application Specific Information:
 Crashing on exception: +[NSGraphicsContext
 graphicsContextWithCGContext:flipped:]: unrecognized selector sent to
 class 0x7fff742b58f8

 Application Specific Backtrace 1:
 0   CoreFoundation                      0x00007fff881f625c
 __exceptionPreprocess + 172
 1   libobjc.A.dylib                     0x00007fff87e6ee75
 objc_exception_throw + 43
 2   CoreFoundation                      0x00007fff881f902d
 +[NSObject(NSObject) doesNotRecognizeSelector:] + 205
 3   CoreFoundation                      0x00007fff88154272
 ___forwarding___ + 1010
 4   CoreFoundation                      0x00007fff88153df8
 _CF_forwarding_prep_0 + 120
 5   QtWidgets                           0x000000010ba32193
 _ZN23QPixmapDropShadowFilter11qt_metacallEN11QMetaObject4CallEiPPv + 5731
 6   QtWidgets                           0x000000010ba435c8
 _ZN23QPixmapDropShadowFilter11qt_metacallEN11QMetaObject4CallEiPPv + 76440
 7   QtWidgets                           0x000000010b70416d
 _ZNK12QCommonStyle11drawControlEN6QStyle14ControlElementEPK12QStyleOptionP8QPainterPK7QWidget
 + 1117
 8   QtWidgets                           0x000000010ba3f4e7
 _ZN23QPixmapDropShadowFilter11qt_metacallEN11QMetaObject4CallEiPPv + 59831
 9   QtWidgets                           0x000000010b737713
 _ZN11QProxyStyle11qt_metacallEN11QMetaObject4CallEiPPv + 93139
 10  QtWidgets                           0x000000010b86bc35
 _ZN11QPushButton10paintEventEP11QPaintEvent + 117
 11  QtWidgets                           0x000000010b6c1613
 _ZN7QWidget5eventEP6QEvent + 1123
 12  QtWidgets                           0x000000010b860430
 _ZN15QAbstractButton5eventEP6QEvent + 160
 13  QtWidgets                           0x000000010b686e3d
 _ZN19QApplicationPrivate13notify_helperEP7QObjectP6QEvent + 301
 ```

 Full crashlog: https://puu.sh/wUNHb/8d00bb1cc3.crash

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Ticket URL: <https://trac.macports.org/ticket/54539>
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