bug#25734: Python - fix imenu regexp for async functions

[Michael Kleehammer <michael@kleehammer.com>]

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This patch is for python mode.  Recently Python 3 added the “async” keyword for functions like so:

    def this_is_not_async():
        pass

    async def this_is_async():
        pass

The mode has already been updated to recognize this for most things, but not imenu.  It currently would show:

    this_is_not_async (def)
    def (async)

The patch below is a minor modification for a regular expression.  The old one simply took the 2nd token on the line to be the name; the new one skips the optional “async” keyword.

Please note the current imenu is unusable in a file with a lot of async functions - it would be nice if this rolled out with 25.2 if possible, which I believe adds the rest of async support.

Thanks,
Michael Kleehammer

diff --git a/lisp/progmodes/python.el b/lisp/progmodes/python.el
index 90b5e4e0dc..5ca23fb9ab 100644
--- a/lisp/progmodes/python.el
+++ b/lisp/progmodes/python.el
@@ -1316,7 +1316,7 @@ marks the next defun after the ones already marked."
 ;;; Navigation

 (defvar python-nav-beginning-of-defun-regexp
-  (python-rx line-start (* space) defun (+ space) (group symbol-name))
+  (python-rx line-start (* space) (* "async" space) defun (+ space) (group symbol-name))
   "Regexp matching class or function definition.
 The name of the defun should be grouped so it can be retrieved
 via `match-string'.")


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