Better support utf-8-with-signature and utf-8-hfs in XML/HTML

* lisp/international/mule.el (sgml-xml-auto-coding-function):
Support UTF-8 with BOM and utf-8-hfs as variants of UTF-8, and
obey the buffer's encoding if it is one of these variants, instead
of re-encoding in UTF-8 proper.  (Bug#20623)

diff --git a/lisp/international/mule.el b/lisp/international/mule.el
index 857fa800eb4d60d2d3cade3fac0c17edce6e7db3..81c04db90e96ac08abb7971f7edb0ac556ff9783 100644 (file)
--- a/lisp/international/mule.el
+++ b/lisp/international/mule.el
@@ -2493,7 +2493,17 @@ This function is intended to be added to `auto-coding-functions'."
            (let* ((match (match-string 1))
                   (sym (intern (downcase match))))
              (if (coding-system-p sym)
-                 sym
+                  ;; If the encoding tag is UTF-8 and the buffer's
+                  ;; encoding is one of the variants of UTF-8, use the
+                  ;; buffer's encoding.  This allows, e.g., saving an
+                  ;; XML file as UTF-8 with BOM when the tag says UTF-8.
+                  (let ((sym-type (coding-system-type sym))
+                        (bfcs-type
+                         (coding-system-type buffer-file-coding-system)))
+                    (if (and (coding-system-equal 'utf-8 sym-type)
+                             (coding-system-equal 'utf-8 bfcs-type))
+                        buffer-file-coding-system
+                     sym))
                (message "Warning: unknown coding system \"%s\"" match)
                nil))
           ;; Files without an encoding tag should be UTF-8. But users
@@ -2506,7 +2516,8 @@ This function is intended to be added to `auto-coding-functions'."
                    (coding-system-base
                     (detect-coding-region (point-min) size t)))))
             ;; Pure ASCII always comes back as undecided.
-            (if (memq detected '(utf-8 undecided))
+            (if (memq detected
+                      '(utf-8 'utf-8-with-signature 'utf-8-hfs undecided))
                 'utf-8
               (warn "File contents detected as %s.
   Consider adding an encoding attribute to the xml declaration,