bug#20752: 24.3; Display of combining characters on OS X after 24.3

[Pavel Iosad]

Hello,

This appears to be a regression -- this works fine in 24.3 but not in
the latest versions. (I'm using the Emacs from emacsforosx.com, on
Mountain Lion, but compiling from source doesn't help). The display of
glyphs with combining diacritics where the precomposed glyph is
unavailable appears to be faulty. Specifically, when the cursor is on
the character, the diacritic is combined with the space to the
right. When the cursor is elsewhere, most frequently nothing at all is
shown (i.e. neither the main character nor the diacritic) or only the
main character remains shown. To reproduce:

Open a buffer (scratch will do)

C-x 8 " a => displays ä
C-\ ipa-x-sampa RET
a _ " => displays ä
b _ " => shows incorrect behaviour

A screenshot is here:
https://www.dropbox.com/s/cx8bg2qljwltbz1/Screenshot%202015-06-05%2011.12.04.png?dl=0

This does not appear to be a font problem, since I am getting this with
multiple fonts and in any case it works fine with 24.3

Thanks!

Pavel
-- 
Pavel Iosad
Roinn a' Chànanachais agus Cànain na Beurla
Oilthigh Dhùn Èideann
Togalach Dhùghaill Stiùbhairt
3 Sràid Theàrlaich
Dùn Èideann EH8 9AD
Alba

http://www.ppls.ed.ac.uk/people/pavel-iosad

Is e buidheann carthannais a tha ann an Oilthigh Dhùn Èideann,
clàraichte ann an Albainn, le àireamh clàraidh SC005336.


In GNU Emacs 24.3.1 (x86_64-apple-darwin12.5.0, NS apple-appkit-1187.40)
 of 2014-11-28 on oilthigh
Windowing system distributor `Apple', version 10.3.1187
Configured using:
 `configure '--with-ns' 'CC=cc -mmacosx-version-min=10.7 ''

Important settings:
  locale-coding-system: nil
  default enable-multibyte-characters: t

Major mode: Fundamental

Minor modes in effect:
  global-flycheck-mode: t
  flycheck-mode: t
  TeX-PDF-mode: t
  magit-auto-revert-mode: t
  diff-auto-refine-mode: t
  recentf-mode: t
  async-bytecomp-package-mode: t
  helm-mode: t
  display-time-mode: t
  golden-ratio-mode: t
  firestarter-mode: t
  shell-dirtrack-mode: t
  pyvenv-mode: t
  show-paren-mode: t
  global-centered-cursor-mode: t
  centered-cursor-mode: t
  global-hl-line-mode: t
  override-global-mode: t
  pallet-mode: t
  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
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
SPC n o <return> M-3 + E N D _ S R C C-p C-e <return> 
C-c ' ( u s e - p a c k a g e SPC c a l d w <backspace> 
<backspace> f w - o r g C-h k C-c a c C-x o C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n M-< C-n C-n 
C-n C-n C-n C-n q <backspace> <return> <tab> : b i 
n d SPC C-x o C-s : b i n d C-s <return> C-x o ( " 
C - v <backspace> x SPC C-x o C-h k C-x c c C-x c c 
C-h k C-x c o C-x o C-x o C-x o q C-x o c SPC o " SPC 
M-x c f w SPC o C-g . SPC c f w M-x c f w C-g : o p 
e n - o r g - c a l e n d a r ) ) C-x C-e C-x c o q 
C-x C-b C-c ' C-x C-s C-n C-p C-p C-p C-n C-n C-x b 
r n w <return> C-n C-n C-p C-p C-n C-p C-x o C-x o 
q C-x C-g <backspace> C-x 1 C-p C-p C-p C-p C-p C-p 
C-n M-x g l y c h <backspace> <backspace> <backspace> 
<backspace> <backspace> f l y c h <return> C-n C-n 
C-n C-n M-x p a n d o c C-o <return> C-x b <return> 
C-x k <return> C-x b m e s s <return> M-> M-v C-n C-n 
C-n C-n C-n C-n C-n C-n C-n C-n C-p C-p C-SPC C-n C-n 
C-n C-n C-n C-n M-w M-x r e p o r t SPC <return>

Recent messages:

Mark set [2 times]

Load-path shadows:
/Users/piosad/.emacs.d/.cask/24.3.1/elpa/ess-20150601.657/.dir-locals hides 
/Applications/Emacs.app/Contents/Resources/lisp/gnus/.dir-locals

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emacs)

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