--- a/eric6/Plugins/ViewManagerPlugins/Tabview/Tabview.py	Thu Apr 08 17:27:12 2021 +0200
+++ b/eric6/Plugins/ViewManagerPlugins/Tabview/Tabview.py	Thu Apr 08 18:27:47 2021 +0200
@@ -1344,7 +1344,7 @@
         """
         if (
             event.type() == QEvent.Type.MouseButtonPress and
-            not event.button() == Qt.MouseButton.RightButton
+            event.button() != Qt.MouseButton.RightButton
         ):
             switched = True
             self.currentTabWidget.showIndicator(False)