Merge from origin/emacs-25

0377fe2 ; Spelling fixes
f253695 Update docs for `customize-mode'
4395aaa Fix documentation of 'assoc-string' and 'compare-strings'
ab0ebb9 ; Only load .elc file in tests.
a98aa02 Error on multibyte characters in HTTP request
ea512a7 * lisp/gnus/mm-decode.el (mm-convert-shr-links): Mask keys th...
8297331 ; Revert "Ensure undo-boundary after insert-file-contents."
dc5e65b Unset GIT_DIR when calling Git commands
6cdd8f7 Ensure undo-boundary after insert-file-contents.
4793f5f Clarify documentation of 'line-spacing' and 'line-height'
5f37572 Fix removal of variables from process-environment
e5e886d * admin/authors.el (authors-ignored-files, authors-valid-file...
db0777b * admin/authors.el (authors-aliases, authors-fixed-case): Add...

# Conflicts:
#	doc/lispref/modes.texi
#	lisp/gnus/mm-decode.el

lisp/url/url-http.el

@@ -307,19 +307,7 @@ The string is based on `url-privacy-level' and `url-user-agent'."
     ;; allows us to elide null lines directly, at the cost of making
     ;; the layout less clear.
     (setq request
-          ;; We used to concat directly, but if one of the strings happens
-          ;; to being multibyte (even if it only contains pure ASCII) then
-          ;; every string gets converted with `string-MAKE-multibyte' which
-          ;; turns the 127-255 codes into things like latin-1 accented chars
-          ;; (it would work right if it used `string-TO-multibyte' instead).
-          ;; So to avoid the problem we force every string to be unibyte.
-          (mapconcat
-           ;; FIXME: Instead of `string-AS-unibyte' we'd want
-           ;; `string-to-unibyte', so as to properly signal an error if one
-           ;; of the strings contains a multibyte char.
-           'string-as-unibyte
-           (delq nil
-            (list
+          (concat
              ;; The request
              (or url-http-method "GET") " "
              (if using-proxy (url-recreate-url url-http-target-url) real-fname)
@@ -398,7 +386,10 @@ The string is based on `url-privacy-level' and `url-user-agent'."
              "\r\n"
              ;; Any data
              url-http-data))
-           ""))
+    ;; Bug#23750
+    (unless (= (string-bytes request)
+               (length request))
+      (error "Multibyte text in HTTP request: %s" request))
     (url-http-debug "Request is: \n%s" request)
     request))