bug#31588: 26.1; format counts some Unicode characters as two

[James P. Ascher]

I've exhausted my ability to debug this one, having ended up in the
C source code, which is a bit beyond me.  I reproduced it with 'emacs
-Q' the following way:

1: Write a dozen x's, i.e. "xxxxxxxxxxxx" on *scratch*.
2: Move pointer to the middle of the line somewhere.
3: M-S-: and call (insert (format "%-2s" '➖))

What I expected:

xxxxx➖ xxxxxxxx

What results:

xxxxxx➖xxxxxxx


In comparison, (insert (format "%-2s" 'z)) gives:

xxxxxxz xxxxxx


And, (insert (format "%-3s" '➖z)) gives:

xxxxxx➖zxxxxxx


The same problem occurs on my setup with ❌ (CROSS MARK).

However, these Unicode items characters work as I expect: ▶ (BLACK
RIGHT-POINTING TRIANGLE), ✚ (HEAVY GREEK CROSS), ▷ (WHITE RIGHT-POINTING
TRIANGLE), and ◼ (BLACK MEDIUM SQUARE).

As far as I can tell, something is off about the styled_format and how
it counts characters- I suspect something about counting
multibyte characters, but it's a little beyond me.

I observed this bug while trying to fix a bug comes from the headers
display of the mu4e package where the overlays that show a deleted flag
are one character too narrow, which displays it incorrectly.


I'm happy to give more info or try other things.  Thanks for all your
hard work on Emacs and I hope this is helpful!

Respectfully submitted,
-James

***The below is NOT my Emacs -Q session, but I left it in case it's
   useful***


In GNU Emacs 26.1 (build 1, x86_64-apple-darwin17.5.0, NS appkit-1561.40 
Version 10.13.4 (Build 17E202))
 of 2018-05-17 built on Grumpys-MacBook.local
Windowing system distributor 'Apple', version 10.3.1561
Recent messages:
find-function-C-source: The C source file editfns.c is not available
Note: file is write protected
Mark saved where search started
Quit
nil
Quit
Entering debugger...
Back to top level
Entering debugger...
Back to top level
nil [3 times]
Configured using:
 'configure --disable-dependency-tracking --disable-silent-rules
 --enable-locallisppath=/usr/local/share/emacs/site-lisp
 --infodir=/usr/local/Cellar/emacs/26.1-rc1/share/info/emacs
 --prefix=/usr/local/Cellar/emacs/26.1-rc1 --without-x --with-xml2
 --without-dbus --with-gnutls --with-imagemagick --with-rsvg
 --without-pop --with-ns --disable-ns-self-contained'

Configured features:
JPEG RSVG IMAGEMAGICK NOTIFY ACL GNUTLS LIBXML2 ZLIB TOOLKIT_SCROLL_BARS
NS THREADS LCMS2

Important settings:
  value of $LANG: en_US.UTF-8
  locale-coding-system: utf-8-unix

Major mode: C/*l

Minor modes in effect:
  shell-dirtrack-mode: t
  helm-mode: t
  helm-descbinds-mode: t
  async-bytecomp-package-mode: t
  yas-global-mode: t
  yas-minor-mode: t
  beacon-mode: t
  global-diff-hl-mode: t
  diff-hl-mode: t
  diff-auto-refine-mode: t
  global-anzu-mode: t
  anzu-mode: t
  volatile-highlights-mode: t
  save-place-mode: t
  savehist-mode: t
  show-smartparens-global-mode: t
  show-smartparens-mode: t
  global-auto-revert-mode: t
  on-screen-global-mode: t
  global-company-mode: t
  delete-selection-mode: t
  auto-insert-mode: t
  cl-old-struct-compat-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
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  mouse-wheel-mode: t
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  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
  buffer-read-only: t
  size-indication-mode: t
  column-number-mode: t
  line-number-mode: t
  global-visual-line-mode: t
  visual-line-mode: t
  transient-mark-mode: t
  abbrev-mode: t

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Features:
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Memory information:
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