Corpus widget - do not reset tokens when same features selected

orangecontrib/text/corpus.py

@@ -162,10 +162,13 @@ def set_text_features(self, feats: Optional[List[Variable]]) -> None:
                         raise ValueError('Feature "{}" not found.'.format(f))
             if len(set(feats)) != len(feats):
                 raise ValueError('Text features must be unique.')
-            self.text_features = feats
+            if feats != self.text_features:
+                # when new features are same than before it is not required
+                # to invalidate tokens
+                self.text_features = feats
+                self._tokens = None  # invalidate tokens
         else:
             self._infer_text_features()
-        self._tokens = None     # invalidate tokens
 
     def set_title_variable(
             self, title_variable: Union[StringVariable, str, None]

orangecontrib/text/widgets/owcorpus.py

@@ -136,7 +136,8 @@ def _load_corpus(path: str, data: Table, state: TaskState) -> Corpus:
             corpus = Corpus.from_table(data.domain, data)
         elif path:
             corpus = Corpus.from_file(path)
-            corpus.name = os.path.splitext(os.path.basename(path))[0]
+            if not hasattr(corpus, "name") or not corpus.name:
+                corpus.name = os.path.splitext(os.path.basename(path))[0]
         return corpus
 
     def open_file(self, path=None, data=None):
@@ -224,7 +225,6 @@ def _setup_title_dropdown(self):
 
     def update_feature_selection(self):
         self.Error.no_text_features_used.clear()
-        # TODO fix VariablesListItemView so it does not emit
         # duplicated data when reordering inside a single window
         def remove_duplicates(l):
             unique = []