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Overlay string not displayed on text with `display' property

From: YAMAMOTO Mitsuharu
Subject: Overlay string not displayed on text with `display' property
Date: Mon, 29 May 2006 16:35:01 +0900 (JST)
User-agent: SEMI/1.14.6 (Maruoka) FLIM/1.14.6 (Marutamachi) APEL/10.6 Emacs/22.0.50 (sparc-sun-solaris2.8) MULE/5.0 (SAKAKI)

I'm not quite sure if this is a bug or not.  Please tell me if it is

An overlay string is not displayed if it is on (before?) the text that
has some `display' property.  For example,

  1. emacs -Q -D
  2. (setq overlay (make-overlay 1 1))
  3. (overlay-put overlay 'before-string "aaa")
     Then "aaa" is displayed at the beginning of buffer.
  4. (put-text-property 1 2 'display "bbb")
     Then "aaa" disappears.

                                     YAMAMOTO Mitsuharu

If emacs crashed, and you have the emacs process in the gdb debugger,
please include the output from the following gdb commands:
    `bt full' and `xbacktrace'.
If you would like to further debug the crash, please read the file
/opt/local/src/emacs/etc/DEBUG for instructions.

In GNU Emacs (sparc-sun-solaris2.8, X toolkit, Xaw3d scroll bars)
 of 2006-05-29 on church
X server distributor `The XFree86 Project, Inc', version 11.0.40300000
configured using `configure '--x-libraries=/usr/local/lib' 'CFLAGS=-g -O2 -mv8 

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: ja
  locale-coding-system: japanese-iso-8bit
  default-enable-multibyte-characters: t

Major mode: Lisp Interaction

Minor modes in effect:
  display-time-mode: t
  tooltip-mode: t
  tool-bar-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  unify-8859-on-encoding-mode: t
  utf-translate-cjk-mode: t
  auto-compression-mode: t
  line-number-mode: t

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