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Completion with (:exclusive 'no) is called twice, and doesn't pass over

From: Vitalie Spinu
Subject: Completion with (:exclusive 'no) is called twice, and doesn't pass over on sole completion.
Date: Fri, 16 Mar 2012 12:05:14 +0100
User-agent: Gnus/5.130004 (Ma Gnus v0.4) Emacs/24.0.94 (gnu/linux)


The completion in emacs 24 is called twice. For example

(defun foo-completion ()
  (when (save-excursion (re-search-backward "\\<\\w*" (point-at-bol) t))
    (let ((token (match-string-no-properties 0))
          (beg (match-beginning 0))
          (end (match-end 0)))
      (message "%s:" token)
      (when (= end (point))
        (list beg end (list "aaaa" "aaaaaaa" "bbbb" "truncat") :exclusive 

(add-to-list 'completion-at-point-functions 'foo-completion) 
;; it is now (foo-completion lisp-completion-at-point t)

Place your point at the end of 'aaaa and you try to complete. I am


in my message buffer. Which means the completion is called twice. I hope
this is not an intended behavior, as it might seriously interfere with
custom completion. For example I might want to have a different behavior
on the second consequent invocation of the completion (give a message,
modify the candidates etc).

Second problem is that if the completion is sole, the handling is not
passed over. For example after 'truncat I am getting a message "Sole
completion" and the lisp-completion-at-point is not reached at all. I
believe it's not how it should work.

In all the rest, new completion system is virtually perfect, thanks.


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