bug#30664: 25.2; eww-download corrupts PDF files (and probably other binary files too)

[omar.antolin@gmail.com]

I tried using eww-download (bound to `d` in eww buffers) to download a
PDF file. This produced, as expected a file in my downloads directory,
but I could not open it in my PDF reader. I immediately suspected that
Emacs had done some unwanted coding system translation on the PDF file.

The variable `last-coding-system-used` was set to `raw-text-dos` (I'm
using Emacs 25.2 on Windows 10), and the `dos` part sounded suspicious
to me. Adding the item `("\\.pdf\\'" no-conversion . no-conversion)` to
the variable `file-coding-system-alist` and redownloading the file fixed
the problem and produced a valid PDF file.

I'm not sure adding that entry to the default value of
`file-coding-system-alist` is the right way to solve this problem
though, because where does it stop? Would we add all known binary file
types to the list with `no-conversion` specifications? I think it 
might be best to modify the function `eww-download-callback` to
save the downloaded file with no-conversion either always or in certain
cases. Maybe the HTTP response can be inspected and if the type is not
text/something to use no-conversion.



In GNU Emacs 25.2.1 (i686-w64-mingw32)
 of 2017-04-24 built on LAPHROAIG
Windowing system distributor 'Microsoft Corp.', version 10.0.16299
Configured using:
 'configure --host=i686-w64-mingw32 --without-dbus
 --without-compress-install 'CFLAGS=-static -O2 -g3''

Configured features:
XPM JPEG TIFF GIF PNG RSVG SOUND NOTIFY ACL GNUTLS LIBXML2 ZLIB
TOOLKIT_SCROLL_BARS

Important settings:
  value of $LANG: ENU
  locale-coding-system: cp1252

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  global-gobble-whitespace-mode: t
  override-global-mode: t
  tooltip-mode: t
  global-eldoc-mode: t
  electric-indent-mode: t
  mouse-wheel-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

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Features:
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eww mm-url bbdb-mua bbdb-com crm mailabbrev bbdb bbdb-site timezone gnus
gnus-ems nnheader mail-utils url-queue url url-proxy url-privacy
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mailcap shr dom subr-x browse-url format-spec colir color smex ido
counsel dired compile comint ansi-color esh-util etags xref project
swiper rainbow-delimiters which-key smartparens-config smartparens
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ivy-overlay ffap thingatpt url-parse auth-source eieio eieio-core
gnus-util mm-util help-fns mail-prsvr password-cache url-vars ace-link
avy hydra ring lv gobble-whitespace edmacro kmacro diminish cl-macs
cl-seq use-package use-package-ensure use-package-delight
use-package-diminish use-package-bind-key bind-key easy-mmode
use-package-core finder-inf tex-site slime-autoloads info package
epg-config seq byte-opt gv bytecomp byte-compile cl-extra help-mode
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eldoc electric uniquify ediff-hook vc-hooks lisp-float-type mwheel
dos-w32 ls-lisp disp-table w32-win w32-vars term/common-win tool-bar dnd
fontset image regexp-opt fringe tabulated-list newcomment elisp-mode
lisp-mode prog-mode register page menu-bar rfn-eshadow timer select
scroll-bar mouse jit-lock font-lock syntax facemenu font-core frame
cl-generic cham georgian utf-8-lang misc-lang vietnamese tibetan thai
tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian
slovak czech european ethiopic indian cyrillic chinese charscript
case-table epa-hook jka-cmpr-hook help simple abbrev minibuffer
cl-preloaded nadvice loaddefs button faces cus-face macroexp files
text-properties overlay sha1 md5 base64 format env code-pages mule
custom widget hashtable-print-readable backquote w32notify w32 multi-tty
make-network-process emacs)

Memory information:
((conses 8 346633 45907)
 (symbols 32 39136 0)
 (miscs 32 154 602)
 (strings 16 91623 67578)
 (string-bytes 1 2621517)
 (vectors 8 42157)
 (vector-slots 4 1449017 44142)
 (floats 8 541 810)
 (intervals 28 531 1239)
 (buffers 520 48))