WId windowObject = this->winId();
  objc_object* nsviewObject = reinterpret_cast<objc_object*>(windowObject);
  objc_object* nsWindowObject = ((id (*)(id, SEL))objc_msgSend)(nsviewObject, sel_registerName("window"));
  int NSWindowCollectionBehaviorCanJoinAllSpaces = 1 << 0;
  ((id (*)(id, SEL, int))objc_msgSend)(nsWindowObject, sel_registerName("setCollectionBehavior"), NSWindowCollectionBehaviorCanJoinAllSpaces);

  // Ignore mouse events on Mac
  // Qt::WindowTransparentForInput bug
  // https://bugreports.qt.io/browse/QTBUG-45498
  ((id (*)(id, SEL, bool))objc_msgSend)(nsWindowObject, sel_registerName("setIgnoresMouseEvents"), true);