OWBaseLearner: Save learner name in workflow

Orange/widgets/utils/owlearnerwidget.py

@@ -67,6 +67,7 @@ class OWBaseLearner(OWWidget, metaclass=OWBaseLearnerMeta):
     LEARNER = None
     supports_sparse = True
 
+    learner_name = Setting(None, schema_only=True)
     want_main_area = False
     resizing_enabled = False
     auto_apply = Setting(True)
@@ -96,7 +97,8 @@ def __init__(self):
         self.data = None
         self.valid_data = False
         self.learner = None
-        self.learner_name = self.name
+        if self.learner_name is None:
+            self.learner_name = self.name
         self.model = None
         self.preprocessors = None
         self.outdated_settings = False

Orange/widgets/utils/tests/test_owlearnerwidget.py

@@ -96,3 +96,19 @@ class WidgetA(OWBaseLearner):
         self.assertIn(WidgetA.Inputs.data.name, inputs)
         self.assertIn(WidgetA.Inputs.preprocessor.name, inputs)
         self.assertIn("A", inputs)
+
+    def test_persists_learner_name_in_settings(self):
+        class WidgetA(OWBaseLearner):
+            name = "A"
+            LEARNER = KNNLearner
+
+            inputs = [("A", None, "set_data")]
+            outputs = [("A", None)]
+
+        w1 = self.create_widget(WidgetA)
+        self.assertEqual(w1.learner_name, "A")
+        w1.learner_name = "MyWidget"
+
+        settings = w1.settingsHandler.pack_data(w1)
+        w2 = self.create_widget(WidgetA, settings)
+        self.assertEqual(w2.learner_name, w1.learner_name)