Don't downcase system diagnostics' first letters

* etc/NEWS: Document this.
* lisp/emacs-lisp/bytecomp.el (byte-compile-file):
* lisp/ffap.el (find-file-at-point):
* lisp/files.el (insert-file-1):
* lisp/net/ange-ftp.el (ange-ftp-barf-if-not-directory)
(ange-ftp-copy-file-internal):
* lisp/progmodes/etags.el (visit-tags-table):
* lisp/url/url-dav.el (url-dav-delete-directory, url-dav-delete-file)
(url-dav-directory-files):
Keep diagnostics consistent with system's.
* lisp/erc/erc-dcc.el (erc-dcc-server):
* lisp/ffap.el (ffap-machine-p):
Ignore case while comparing diagnostics.
* src/fileio.c (report_file_errno): Don't downcase, and simplify.
Fixes: bug#19642

2 files changed, 10 insertions, 0 deletions

diff --git a/etc/ChangeLog b/etc/ChangeLog
index 7b64dfb9153..47f61f4d7fd 100644
--- a/etc/ChangeLog
+++ b/etc/ChangeLog
@@ -1,3 +1,8 @@
+2015-01-22  Paul Eggert  <eggert@cs.ucla.edu>
+
+        Don't downcase system diagnostics' first letters
+        * NEWS: Document this.
+
 2015-01-16  Artur Malabarba  <bruce.connor.am@gmail.com>
 
         * NEWS: Document installing packages from directories.
diff --git a/etc/NEWS b/etc/NEWS
index 120d8b920c6..db47033fb35 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -538,6 +538,11 @@ position list returned for such events is now nil.
 These slots used to hold key-shortcut data, but have been obsolete since
 Emacs-21.
 
+** Emacs no longer downcases the first letter of a system diagnostic
+when signaling a file error.  For example, it now reports "Permission
+denied" instead of "permission denied".  The old behavior was problematic
+in languages like German where downcasing rules depend on grammar.
+
 
 * Lisp Changes in Emacs 25.1