bug#7831: 23.2; raise display property broken on Mac OS X

bug#7831: 23.2; raise display property broken on Mac OS X

[Christopher Genovese]

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The raise display property appears to be broken in Emacs 23.2.1
running on Mac OS X 10.5.8 (using --with-ns). I first noticed this in
AucTeX when the subscripts did not drop as they did with say Carbon
Emacs 22. But I can reproduce the behavior using Emacs -Q even in
fundamental mode.

When one character, say, is given the raise property, e.g., (raise -0.3),
the entire line shifts (and spaces out somewhat), and the cursor becomes
taller when over that character.  But the character itself does not
drop.

This is easily seen in an AucTeX buffer (either plain-TeX-mode or
LaTeX-mode): type $A_f$, and the f is shrunken as it should but the line
goes down so that the A and f have the same top.

But for a simple test in Fundamental mode, type "hello, world!" and
position the cursor on the second ell. Then do

  (text-properties-at (point))      ; returns nil
  (add-text-properties (point) (1+ (point)) '(display (raise -0.3)))  ;
returns t, line shifts down, cursor grows tall
  (text-properties-at (point))      ; returns (display (raise -0.3))
  (forward-char)
  (text-properties-at (point))      ; returns nil
  (backward-char 2)
  (text-properties-at (point))      ; returns nil

If instead one does (raise 0.3), the behavior is *exactly the same*,
the line shifts down and the cursor grows tall.

Using Carbon Emacs 22 as a comparison, the same steps there
produce a single dropped (or raised with positive value) ell
in an otherwise unaffected line. This is the proper behavior.

The information from report-emacs-bug (under Emacs -Q)
is appended below.

   Thanks,

     Chris


In GNU Emacs 23.2.1 (i386-apple-darwin9.8.0, NS apple-appkit-949.54)
 of 2010-11-09 on christopher-genoveses-macbook-pro.local
Windowing system distributor `Apple', version 10.3.949
configured using `configure  '--with-ns''

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: en_US.UTF-8
  value of $XMODIFIERS: nil
  locale-coding-system: utf-8-unix
  default enable-multibyte-characters: t

Major mode: Any (esp. AucTeX and fundamental-mode)

Minor modes in effect:
  tooltip-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
C-h c C-w s-x <escape> x r e p o r t - e m a c s -
b u g <return>

Recent messages:
For information about GNU Emacs and the GNU system, type C-h C-a.
C-w runs the command kill-region
kill-region: The mark is not set now, so there is no region

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hex-util hashcash mail-utils emacsbug tooltip ediff-hook vc-hooks
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lisp-mode register page menu-bar rfn-eshadow timer select scroll-bar
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abbrev loaddefs button minibuffer faces cus-face files text-properties
overlay md5 base64 format env code-pages mule custom widget
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emacs)

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