OWFile: Fix invalid settings reuse

As domain editor shows variable's values, it should only reuse settings
when two discrete variables have the same settings.

Orange/tests/__init__.py

@@ -7,8 +7,9 @@
 
 
 @contextmanager
-def named_file(content, encoding=None):
-    file = tempfile.NamedTemporaryFile("wt", delete=False, encoding=encoding)
+def named_file(content, encoding=None, suffix=None):
+    file = tempfile.NamedTemporaryFile("wt", delete=False,
+                                       encoding=encoding, suffix=suffix)
     file.write(content)
     name = file.name
     file.close()

Orange/widgets/data/owfile.py

@@ -86,7 +86,9 @@ class OWFile(widget.OWWidget, RecentPathsWComboMixin):
     SIZE_LIMIT = 1e7
     LOCAL_FILE, URL = range(2)
 
-    settingsHandler = PerfectDomainContextHandler()
+    settingsHandler = PerfectDomainContextHandler(
+        match_values=PerfectDomainContextHandler.MATCH_VALUES_ALL
+    )
 
     # Overload RecentPathsWidgetMixin.recent_paths to set defaults
     recent_paths = Setting([

Orange/widgets/data/tests/test_owfile.py

@@ -11,6 +11,7 @@
 import Orange
 from Orange.data import FileFormat, dataset_dirs, StringVariable, Table, \
     Domain, DiscreteVariable
+from Orange.tests import named_file
 from Orange.widgets.data.owfile import OWFile
 from Orange.widgets.tests.base import WidgetTest
 
@@ -140,3 +141,27 @@ def test_check_column_noname(self):
         self.assertEqual(self.widget.domain_editor.model().data(idx, Qt.DisplayRole), temp)
         self.widget.domain_editor.model().setData(idx, "", Qt.EditRole)
         self.assertEqual(self.widget.domain_editor.model().data(idx, Qt.DisplayRole), temp)
+
+    def test_context_match_includes_variable_values(self):
+        file1="""\
+var
+a b
+
+a
+"""
+        file2="""\
+var
+a b c
+
+a
+"""
+        editor = self.widget.domain_editor
+        idx = self.widget.domain_editor.model().createIndex(0, 3)
+
+        with named_file(file1, suffix=".tab") as filename:
+            self.open_dataset(filename)
+            self.assertEqual(editor.model().data(idx, Qt.DisplayRole), "a, b")
+
+        with named_file(file2, suffix=".tab") as filename:
+            self.open_dataset(filename)
+            self.assertEqual(editor.model().data(idx, Qt.DisplayRole), "a, b, c")