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bug#36516: Wrong dynamic abbrev expansion after space

From: Noam Postavsky
Subject: bug#36516: Wrong dynamic abbrev expansion after space
Date: Mon, 22 Jul 2019 11:34:37 -0400
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1.92 (windows-nt)

Juri Linkov <address@hidden> writes:

> 2. On the third line type:
>  s                      ;; self-insert-command
>  M-/                    ;; dabbrev-expand
>  SPC                    ;; self-insert-command
>  M-/                    ;; dabbrev-expand
>  M-/                    ;; dabbrev-expand
> 3. The word after "str " is expanded to some random word.

It's due to this code in dabbrev.el:

(defun dabbrev-expand (arg)
        ;; If the user inserts a space after expanding
        ;; and then asks to expand again, always fetch the next word.
        (if (and (eq (preceding-char) ?\s)
                 (markerp dabbrev--last-abbrev-location)
                 (marker-position dabbrev--last-abbrev-location)
                 (= (point) (1+ dabbrev--last-abbrev-location)))
              ;; The "abbrev" to expand is just the space.
              (setq abbrev " ")

This triggers on the second M-/ in your recipe above, which causes the
third M-/ to expand " " instead of "str ".  Not sure what to do about it
though.  Removing this `if' will fix your case, but probably break

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