quickfix: do not check for invalid characters

src/gui_qt/io/filedialog.py

@@ -47,6 +47,8 @@ class FileDialog(QtWidgets.QFileDialog):
 
     @staticmethod
     def is_valid(filename: str):
+        return True
+
         bad_character = r'/*<>\|:"'
         for c in bad_character:
             if c in filename: