fixed the function for different kinds of paths

gui/widgets.py

@@ -169,8 +169,15 @@ class DirWidget(QWidget):
     def set_dir(self):
         directory = QFileDialog.getExistingDirectory(self, "Select a directory.", dir=self.directory)
         if directory:
-            directory = Path(directory).relative_to(Path.cwd()).as_posix()
-            self.directory = "./" + directory
+            directory = Path(directory)
+
+            if Path.cwd() in directory.parents:
+                self.directory = "./" + directory.relative_to(Path.cwd()).as_posix()
+            elif Path.cwd() == directory:
+                self.directory = "."
+            else:
+                self.directory = directory.as_posix()
+
             self.dir_lineedit.setText(self.directory)