[PATCH] Fix python-info-current-defun performance for large defuns

[Tom Gillespie]

Hi,
   Here is a patch to fix a performance issue in
python-info-current-defun that appears when the function
is run on large defuns. The issue can appear to the user as a
noticeable (~500ms) freeze when the point is in a large defun
in a python buffer with which-function-mode enabled. More
details in the commit message and comments in the code.

I made the patch against the emacs-29 branch, but will also
on master without issue.

Best,
Tom

0001-Fix-python-info-current-defun-performance-for-large-.patch
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