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invisible&after-string of overlay

From: Kenichi Handa
Subject: invisible&after-string of overlay
Date: Tue, 11 Nov 2003 09:47:00 +0900 (JST)
User-agent: SEMI/1.14.3 (Ushinoya) FLIM/1.14.2 (Yagi-Nishiguchi) APEL/10.2 Emacs/21.3 (sparc-sun-solaris2.6) MULE/5.0 (SAKAKI)

I've got a bug report about the combination of invisible and
after-string properties of an overlay.

Please evaluate this in *scratch* buffer.

  (goto-char (point-min))
  (insert "123\n")
  (let ((o1 (make-overlay 1 2))
        (o2 (make-overlay 2 3)))
    (overlay-put o1 'invisible t)
    (overlay-put o1 'evaporate t)
    (overlay-put o1 'after-string "A")
    (overlay-put o2 'invisible t)
    (overlay-put o2 'evaporate t)
    (overlay-put o2 'after-string "B")))

Emacs 21.3 and HEAD displays "B3" in the first line, but
Emacs 20.7 displays "AB3".  It seems that the latter is
correct.  Is it a feature change or a bug?

Ken'ichi HANDA

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