fixed problematic self deletion without having the GIL and while iterating the loop

Author: florianlink

src/PythonQtSignalReceiver.cpp

@@ -265,20 +265,24 @@ int PythonQtSignalReceiver::qt_metacall(QMetaObject::Call c, int id, void **argu
     QObject::qt_metacall(c, id, arguments);
   }
 
-  Q_FOREACH(const PythonQtSignalTarget& t, _targets) {
+  bool shouldDelete = false;
+  for(const PythonQtSignalTarget& t : _targets) {
     if (t.slotId() == id) {
       t.call(arguments);
       // if the signal is the last destroyed signal, we delete ourselves
       int sigId = t.signalId();
       if ((sigId == _destroyedSignal1Id) || (sigId == _destroyedSignal2Id)) {
         _destroyedSignalCount--;
         if (_destroyedSignalCount == 0) {
-          delete this;
+          shouldDelete = true;
         }
       }
       break;
     }
   }
+  if (shouldDelete) {
+    delete this;
+  }
   return 0;
 }