Package: emacs25
Version: 25.2+1-6
Severity: grave
Justification: causes non-serious data loss

Under some conditions, when saving a file with a BOM, the BOM
*silently* gets removed, which is a major change (some applications,
such as Firefox, are BOM-sensitive, so that this bug breaks things
without knowing the cause).

To reproduce the bug:

0. Uncompress the attached file (I used compression to make sure that
   it doesn't get corrupted by the mail system): unxz a.html.xz

1. cp a.html b.html

2. emacs -Q b.html

3. Type M-: (set-buffer-modified-p t) to mark the buffer as modified
   (so that one can save it).

4. Save the file with C-x C-s.

5. Quit with C-x C-c.

6. cmp a.html b.html

This gives:

a.html b.html differ: char 1, line 1

$ hd a.html | head -n 1
00000000  ef bb bf 3c 21 44 4f 43  54 59 50 45 20 68 74 6d  |...<!DOCTYPE htm|

$ hd b.html | head -n 1
00000000  3c 21 44 4f 43 54 59 50  45 20 68 74 6d 6c 20 50  |<!DOCTYPE html P|

Note: There is a newer Emacs version upstream. I haven't tried it.

-- System Information:
Debian Release: buster/sid
  APT prefers unstable-debug
  APT policy: (500, 'unstable-debug'), (500, 'stable-updates'), (500, 
'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 4.14.0-1-amd64 (SMP w/8 CPU cores)
Locale: LANG=POSIX, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8), LANGUAGE=POSIX 
(charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)

Versions of packages emacs25 depends on:
ii  emacs25-bin-common     25.2+1-6
ii  libacl1                2.2.52-3+b1
ii  libasound2             1.1.3-5
ii  libatk1.0-0            2.26.1-1
ii  libc6                  2.25-3
ii  libcairo-gobject2      1.14.10-1
ii  libcairo2              1.14.10-1
ii  libdbus-1-3            1.12.2-1
ii  libfontconfig1         2.12.6-0.1
ii  libfreetype6           2.6.3-3.2
ii  libgdk-pixbuf2.0-0     2.36.11-1
ii  libgif7                5.1.4-1
ii  libglib2.0-0           2.54.2-1
ii  libgnutls30            3.5.16-1
ii  libgomp1               7.2.0-16
ii  libgpm2                1.20.4-6.2+b1
ii  libgtk-3-0             3.22.26-2
ii  libice6                2:1.0.9-2
ii  libjpeg62-turbo        1:1.5.2-2
ii  libm17n-0              1.7.0-3+b2
ii  libmagickcore-6.q16-3  8:6.9.7.4+dfsg-16
ii  libmagickwand-6.q16-3  8:6.9.7.4+dfsg-16
ii  libotf0                0.9.13-3+b1
ii  libpango-1.0-0         1.40.13-2
ii  libpangocairo-1.0-0    1.40.13-2
ii  libpng16-16            1.6.34-1
ii  librsvg2-2             2.40.18-2
ii  libselinux1            2.7-2
ii  libsm6                 2:1.2.2-1+b3
ii  libtiff5               4.0.8-6
ii  libtinfo5              6.0+20171125-1
ii  libx11-6               2:1.6.4-3
ii  libx11-xcb1            2:1.6.4-3
ii  libxcb1                1.12-1
ii  libxfixes3             1:5.0.3-1
ii  libxft2                2.3.2-1+b2
ii  libxinerama1           2:1.1.3-1+b3
ii  libxml2                2.9.4+dfsg1-5.1
ii  libxpm4                1:3.5.12-1
ii  libxrandr2             2:1.5.1-1
ii  libxrender1            1:0.9.10-1
ii  zlib1g                 1:1.2.8.dfsg-5

emacs25 recommends no packages.

Versions of packages emacs25 suggests:
ii  emacs25-common-non-dfsg  25.2+1-1

-- no debconf information

Attachment: a.html.xz
Description: Binary data

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