--- a/eric6/Graphics/UMLGraphicsView.py Thu Mar 04 17:43:11 2021 +0100 +++ b/eric6/Graphics/UMLGraphicsView.py Thu Mar 04 17:44:41 2021 +0100 @@ -74,7 +74,11 @@ Private method to initialize the view actions. """ self.alignMapper = QSignalMapper(self) - self.alignMapper.mapped[int].connect(self.__alignShapes) + try: + self.alignMapper.mappedInt.connect(self.__alignShapes) + except AttributeError: + # pre Qt 5.15 + self.alignMapper.mapped[int].connect(self.__alignShapes) self.deleteShapeAct = QAction( UI.PixmapCache.getIcon("deleteShape"),