Merge pull request #1796 from ales-erjavec/fixes/confusionmatrix-migr…

…ate-settings

[FIX] owconfusionmatix: Add migrate_settings

Orange/widgets/evaluate/owconfusionmatrix.py

@@ -91,6 +91,7 @@ class OWConfusionMatrix(widget.OWWidget):
                   "Proportion of predicted",
                   "Proportion of actual"]
 
+    settings_version = 1
     settingsHandler = settings.ClassValuesContextHandler()
 
     selected_learner = settings.Setting([0], schema_only=True)
@@ -483,6 +484,19 @@ def send_report(self):
                        self.quantities[self.selected_quantity].lower()),
                 self.tableview)
 
+    @classmethod
+    def migrate_settings(cls, settings, version):
+        super().migrate_settings(settings, version)
+        if not version:
+            # For some period of time the 'selected_learner' property was
+            # changed from List[int] -> int
+            # (commit 4e49bb3fd0e11262f3ebf4b1116a91a4b49cc982) and then back
+            # again (commit 8a492d79a2e17154a0881e24a05843406c8892c0)
+            if "selected_learner" in settings and \
+                    isinstance(settings["selected_learner"], int):
+                settings["selected_learner"] = [settings["selected_learner"]]
+
+
 if __name__ == "__main__":
     from AnyQt.QtWidgets import QApplication