vim-patch:6e649224926b (#15911)

Update runtime files
https://github.com/vim/vim/commit/6e649224926bbc1df6a4fdfa7a96b4acb1f8bee0

runtime/indent/python.vim

@@ -2,7 +2,7 @@
 " Language:		Python
 " Maintainer:		Bram Moolenaar <Bram@vim.org>
 " Original Author:	David Bustos <bustos@caltech.edu>
-" Last Change:		2021 May 26
+" Last Change:		2021 Sep 26
 
 " Only load this indent file when no other was loaded.
 if exists("b:did_indent")
@@ -17,6 +17,8 @@ setlocal autoindent	" indentexpr isn't much help otherwise
 setlocal indentexpr=GetPythonIndent(v:lnum)
 setlocal indentkeys+=<:>,=elif,=except
 
+let b:undo_indent = "setl ai< inde< indk< lisp<"
+
 " Only define the function once.
 if exists("*GetPythonIndent")
   finish