Do not select current record if it is no more in the group

on_change calls may remove the current record without updating the screen such
that it is not possible to compute a selection path.

Closes #13770
(grafted from ceb83d197bfcced51643cb723590cd97127eda86)

--HG--
branch : 6.0

tryton/tryton/gui/window/view_form/view/list.py

@@ -1032,6 +1032,10 @@ class ViewTree(View):
     def display(self, force=False):
         self.treeview.display_counter += 1
         current_record = self.record
+        if current_record and current_record not in current_record.group:
+            # current record may have been removed by on_change calls without
+            # changing the current record of screen before the display
+            current_record = None
         if (force
                 or not self.treeview.get_model()
                 or self.group != self.treeview.get_model().group):