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bug#1948: confusion and bug in dabbrev.el

From: Alan J Third
Subject: bug#1948: confusion and bug in dabbrev.el
Date: Sun, 10 Jan 2016 13:41:38 +0000
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/24.5 (darwin)

Alan J Third <address@hidden> writes:

> Type:
> one  tt
> one  ww
> Then in the next line I have to type:
> one 
>    ^- space
> and M-/ (dabbrev-expand) completes it to:
> one ww
> Then if I hit M-/ again, point jumps up to the line above and replaces
> "ww". Subsequent M-/'s continue to fiddle with the same line.

I got this slightly wrong. The full set of commands is:


one  tt
one  ww
on M-/ SPC M-/ M-/

I've written a test, but I'm not sure what to do with it:

(ert-deftest dabbrev-expand-test ()
  "Test for bug#1948.
When DABBREV-ELIMINATE-NEWLINES is non-nil (the default),
repeated calls to DABBREV-EXPAND can result in the source of
first expansion being replaced rather than the destination."
   (insert "ab  x\na\nab  y")
   (goto-char 8)
     (set-window-buffer nil (current-buffer))
     ;; M-/ SPC M-/ M-/
     (execute-kbd-macro "\257 \257\257"))
   (should (string= (buffer-string) "ab  x\nab y\nab  y"))))

I haven't signed the copyright assignment stuff.
Alan Third

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