Network Explorer: Clear selection on new network (on none)

orangecontrib/network/widgets/OWNxExplorer.py

@@ -493,6 +493,7 @@ def set_checkboxes(value):
         if self.positions is None:
             set_actual_edges()
             self.set_random_positions()
+            self.clear()
             self.graph.reset_graph()
             self.relayout()
         else:
@@ -547,6 +548,10 @@ def send_data(self):
         else:
             Outputs.distances.send(distances.submatrix(sorted(selected_indices)))
 
+    def clear(self):
+        super().clear()
+        self.nSelected = 0
+
     def get_coordinates_data(self):
         if self.positions is not None:
             return self.positions.T

orangecontrib/network/widgets/tests/test_OWNxExplorer.py

@@ -1,4 +1,5 @@
 import unittest
+from unittest.mock import Mock
 
 import numpy as np
 
@@ -36,7 +37,6 @@ def test_too_many_labels(self):
 
     def test_subset_selection(self):
         # test if selecting from the graph works
-
         self.send_signal(self.widget.Inputs.network, self.network)
         self.assertEqual(self.widget.nSelected, 0)
         self.send_signal(self.widget.Inputs.node_data, self.data)
@@ -96,6 +96,16 @@ def test_input_subset(self):
         sub_mask = self.widget.get_subset_mask()
         self.assertIsNone(sub_mask)
 
+    def test_clear_selection_on_no_data(self):
+        self.widget.relayout = Mock()
+        self.send_signal(self.widget.Inputs.network, self.network)
+        self.widget.graph.selection_select(np.arange(0, 5))
+        self.assertEqual(self.widget.nSelected, 5)
+        self.assertIsNotNone(self.widget.selection)
+        self.send_signal(self.widget.Inputs.network, None)
+        self.assertEqual(self.widget.nSelected, 0)
+        self.assertIsNone(self.widget.selection)
+
 
 if __name__ == "__main__":
     unittest.main()