Correct the print sequence when discarding the current changes

CURA-7827

cura/Settings/ContainerManager.py

@@ -345,6 +345,9 @@ class ContainerManager(QObject):
         # user changes are possibly added to make the current setup match the current enabled extruders
         machine_manager.correctExtruderSettings()
 
+        # The Print Sequence should be changed to match the current setup
+        machine_manager.correctPrintSequence()
+
         for container in send_emits_containers:
             container.sendPostponedEmits()
 

cura/Settings/MachineManager.py

@@ -128,7 +128,7 @@ class MachineManager(QObject):
         self.activeQualityChangesGroupChanged.connect(self.activeQualityDisplayNameChanged)
 
         self.activeStackValueChanged.connect(self._reCalculateNumUserSettings)
-        self.numberExtrudersEnabledChanged.connect(self._correctPrintSequence)
+        self.numberExtrudersEnabledChanged.connect(self.correctPrintSequence)
 
     activeQualityDisplayNameChanged = pyqtSignal()
 
@@ -858,7 +858,7 @@ class MachineManager(QObject):
                 title = catalog.i18nc("@info:title", "Settings updated"))
             caution_message.show()
 
-    def _correctPrintSequence(self) -> None:
+    def correctPrintSequence(self) -> None:
         """
         Sets the Print Sequence setting to "all-at-once" when there are more than one enabled extruders.