Improve completion in IPython/Python 3.13

IPython/Python 3.13 indirectly imports rlcompleter, and the
completer is set up to reference rlcompleter.__main__.
However, this rlcompleter.__main__ is different from the
__main__ in the REPL execution.  Therefore, this completer
cannot correctly complete the REPL globals.  To address this
issue, we override rlcompleter.__main__ with __main__ only in
the case of IPython.

* lisp/progmodes/python.el (python-shell-completion-native-setup):
Modify __PYTHON_EL_native_completion_setup().  (Bug#76205)

Author: kobarity

lisp/progmodes/python.el

@@ -4537,6 +4537,13 @@ def __PYTHON_EL_native_completion_setup():
             if not is_ipython:
                 readline.set_completer(new_completer)
             else:
+                # Ensure that rlcompleter.__main__ and __main__ are identical.
+                # (Bug#76205)
+                import sys
+                try:
+                    sys.modules['rlcompleter'].__main__ = sys.modules['__main__']
+                except KeyError:
+                    pass
                 # Try both initializations to cope with all IPython versions.
                 # This works fine for IPython 3.x but not for earlier:
                 readline.set_completer(new_completer)