Cleanup

This points out a potential problem with a previous fix for compatibility with https://github.com/pyqt/python-qt. Before, these members were tested against existing members, but now they are blindly added via `setattr`. It's safe, since we've already tested these and know for sure that they aren't being overwritten. But it still opens the door for these to one day override a newly added member.

Luckily, this is only relevant until the next major release, upon which they are all discarded.

Author: mottosso

Qt.py

@@ -375,6 +375,7 @@ def _maintain_backwards_compatibility(binding):
 
     for member in ("__binding__",
                    "__binding_version__",
+                   "__qt_version__",
                    "__added__",
                    "__remapped__",
                    "__modified__",
@@ -387,9 +388,5 @@ def _maintain_backwards_compatibility(binding):
     setattr(binding, "__wrapper_version__", self.__version__)
     self.__added__.append("__wrapper_version__")
 
-    # Related to compatibility with python-qt. See issue #135
-    setattr(binding, "__qt_version__", self.__qt_version__)
-    self.__added__.append("__qt_version__")
-
 
 cli(sys.argv[1:]) if __name__ == "__main__" else init()