Simplify discardOrKeepProfileChangesClosed()

cura/CuraApplication.py

@@ -451,27 +451,18 @@ class CuraApplication(QtApplication):
 
     @pyqtSlot(str)
     def discardOrKeepProfileChangesClosed(self, option):
+        global_stack = self.getGlobalContainerStack()
         if option == "discard":
-            global_stack = self.getGlobalContainerStack()
-            for extruder in self._extruder_manager.getMachineExtruders(global_stack.getId()):
-                extruder.getTop().clear()
-            global_stack.getTop().clear()
+            for extruder in global_stack.extruders.values():
+                extruder.userChanges.clear()
+            global_stack.userChanges.clear()
 
         # if the user decided to keep settings then the user settings should be re-calculated and validated for errors
         # before slicing. To ensure that slicer uses right settings values
         elif option == "keep":
-            global_stack = self.getGlobalContainerStack()
-            for extruder in self._extruder_manager.getMachineExtruders(global_stack.getId()):
-                user_extruder_container = extruder.getTop()
-                if user_extruder_container:
-                    user_extruder_container.update()
-
-            user_global_container = global_stack.getTop()
-            if user_global_container:
-                user_global_container.update()
-
-        # notify listeners that quality has changed (after user selected discard or keep)
-        self.getMachineManager().activeQualityChanged.emit()
+            for extruder in global_stack.extruders.values():
+                extruder.userChanges.update()
+            global_stack.userChanges.update()
 
     @pyqtSlot(int)
     def messageBoxClosed(self, button):