RecentFiles: Check for missing file in workflow dir

When opening saved workflow and file widget detects missing file, check if the file is placed in the same directory as workflow is saved.

Author: VesnaT

Orange/widgets/data/tests/test_owfile.py

@@ -1,6 +1,6 @@
 # Test methods with long descriptive names can omit docstrings
 # pylint: disable=missing-docstring
-from os import path, remove
+from os import path, remove, getcwd
 from unittest.mock import Mock, patch
 import pickle
 import tempfile
@@ -27,6 +27,7 @@
 from Orange.widgets.utils.domaineditor import ComboDelegate, VarTypeDelegate, VarTableModel
 
 TITANIC_PATH = path.join(path.dirname(Orange.__file__), 'datasets', 'titanic.tab')
+orig_path_exists = path.exists
 
 
 class FailedSheetsFormat(FileFormat):
@@ -440,3 +441,22 @@ def test_adds_origin(self):
         attrs = data1.domain["image"].attributes
         self.assertIn("origin", attrs)
         self.assertIn("origin1", attrs["origin"])
+
+    @patch("Orange.widgets.widget.OWWidget.workflowEnv",
+           Mock(return_value={"basedir": getcwd()}))
+    def test_open_moved_workflow(self):
+        """Test opening workflow that has been moved to another location
+        (i.e. sent by email), considering data file is stored in the same
+        directory as the workflow.
+        """
+        recent_path = RecentPath(
+            "Users/temp/datasets/test.tab", "", "datasets/test.tab"
+        )
+        stored_settings = {"recent_paths": [recent_path]}
+        f = open("test.tab", 'w')
+        f.close()
+        w = self.create_widget(OWFile, stored_settings=stored_settings)
+        w.load_data()
+        self.assertEqual(w.file_combo.count(), 1)
+        self.assertFalse(w.Error.file_not_found.is_shown())
+        remove("test.tab")

Orange/widgets/utils/filedialogs.py

@@ -240,14 +240,17 @@ def search(self, searchpaths):
     def resolve(self, searchpaths):
         if self.prefix is None and os.path.exists(self.abspath):
             return self
-        elif self.prefix is not None:
+        else:
             for prefix, base in searchpaths:
-                if self.prefix == prefix:
+                path = None
+                if self.prefix and self.prefix == prefix:
                     path = os.path.join(base, self.relpath)
-                    if os.path.exists(path):
-                        return RecentPath(
-                            os.path.normpath(path), self.prefix, self.relpath,
-                            file_format=self.file_format)
+                elif not self.prefix and prefix == "basedir":
+                    path = os.path.join(base, self.basename)
+                if path and os.path.exists(path):
+                    return RecentPath(
+                        os.path.normpath(path), self.prefix, self.relpath,
+                        file_format=self.file_format)
         return None
 
     @property