bug#56105: 29.0.50; python-nav-beginning-of-defun does not handle nested functions properly

[kobarity <kobarity@gmail.com>]

Hi,

The following steps will place the point at the beginning of the line
"def bar():", not the line "def foo():".

1. emacs -Q
2. Load the following Python file using M-x find-file

#+begin_src python
def foo():
    def bar():
        pass
    pass
#+end_src

3. M->
4. M-: (python-nav-beginning-of-defun)

This issue causes mark-defun/python-mark-defun to mark only the
function bar, not the function foo, if the point is located at the end
of the buffer.

Best Regards,

--

In GNU Emacs 29.0.50 (build 3, x86_64-pc-linux-gnu)
 of 2022-06-19 built on ubuntu
System Description: Ubuntu 22.04 LTS

Configured using:
 'configure --without-x --with-gnutls=ifavailable'

Configured features:
ACL LIBXML2 MODULES NOTIFY INOTIFY PDUMPER SECCOMP SOUND SQLITE3 THREADS
XIM ZLIB

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: Python

Minor modes in effect:
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  show-paren-mode: t
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  font-lock-mode: t
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  line-number-mode: t
  transient-mark-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t

Load-path shadows:
None found.

Features:
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Memory information:
((conses 16 53843 6906)
 (symbols 48 6607 1)
 (strings 32 18599 1675)
 (string-bytes 1 607055)
 (vectors 16 10579)
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