m2ym/auto-complete — pull request #69 by iRi-E (2012-01-30 22:34:23+00:00)
Title: Fixed issue #65 (ac-symbol-documentation() not working for functions in Emacs 24)

In Emacs 24, help-buffer() checks if current buffer is help-mode, so 'major-mode' needs to be bound to 'help-mode' before calling describe-function(). (It's unnecessary to call help-mode() to start the help-mode actually.)

I think that another solution a45aee86d7e2bfd6f5940987591f5791ca0437f8 by purcell is not good because "\*Help\*" buffer should be changed every time describe-function() is called.