diff --git a/doc/lispref/markers.texi b/doc/lispref/markers.texi
index b39373f0727..80f79b67e52 100644
--- a/doc/lispref/markers.texi
+++ b/doc/lispref/markers.texi
@@ -609,8 +609,8 @@ the function @code{use-region-p} for that (@pxref{The Region}).
 @defvarx deactivate-mark-hook
 These normal hooks are run, respectively, when the mark becomes active
 and when it becomes inactive.  The hook @code{activate-mark-hook} is
-also run at the end of the command loop if the mark is active and it
-is possible that the region may have changed.
+also run when the region is reactivated, for instance after using a
+command that switches back to a buffer that has an active mark.
 @ignore
 This piece of command_loop_1, run unless deactivating the mark:
   if (current_buffer != prev_buffer || MODIFF != prev_modiff)
diff --git a/doc/lispref/sequences.texi b/doc/lispref/sequences.texi
index 0c74dbe2aa4..545fd408f88 100644
--- a/doc/lispref/sequences.texi
+++ b/doc/lispref/sequences.texi
@@ -609,7 +609,7 @@ returned value is a list.
 (seq-map-indexed (lambda (elt idx)
                    (list idx elt))
                  '(a b c))
-@result{} ((0 a) (b 1) (c 2))
+@result{} ((0 a) (1 b) (2 c))
 @end group
 @end example
 @end defun
diff --git a/lisp/simple.el b/lisp/simple.el
index a4da3f58a99..7c0b6e1d745 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -5976,8 +5976,9 @@ START and END specify the portion of the current buffer to be copied."
 
 (defvar activate-mark-hook nil
   "Hook run when the mark becomes active.
-It is also run at the end of a command, if the mark is active and
-it is possible that the region may have changed.")
+It is also run when the region is reactivated, for instance after
+using a command that switches back to a buffer that has an active
+mark.")
 
 (defvar deactivate-mark-hook nil
   "Hook run when the mark becomes inactive.")
diff --git a/lisp/w32-fns.el b/lisp/w32-fns.el
index 9ef2da737a4..2548fa4d448 100644
--- a/lisp/w32-fns.el
+++ b/lisp/w32-fns.el
@@ -255,6 +255,7 @@ bit output with no translation."
   (w32-add-charset-info "iso8859-2" 'w32-charset-easteurope 28592)
   (w32-add-charset-info "iso8859-3" 'w32-charset-turkish 28593)
   (w32-add-charset-info "iso8859-4" 'w32-charset-baltic 28594)
+  (w32-add-charset-info "iso8859-5" 'w32-charset-russian 28595)
   (w32-add-charset-info "iso8859-6" 'w32-charset-arabic 28596)
   (w32-add-charset-info "iso8859-7" 'w32-charset-greek 28597)
   (w32-add-charset-info "iso8859-8" 'w32-charset-hebrew 1255)
diff --git a/src/w32.c b/src/w32.c
index a3c247b8b0d..aade8024811 100644
--- a/src/w32.c
+++ b/src/w32.c
@@ -346,6 +346,7 @@ static BOOL g_b_init_get_adapters_addresses;
 static BOOL g_b_init_reg_open_key_ex_w;
 static BOOL g_b_init_reg_query_value_ex_w;
 static BOOL g_b_init_expand_environment_strings_w;
+static BOOL g_b_init_get_user_default_ui_language;
 
 BOOL g_b_init_compare_string_w;
 BOOL g_b_init_debug_break_process;
@@ -533,6 +534,7 @@ DWORD multiByteToWideCharFlags;
 typedef LONG (WINAPI *RegOpenKeyExW_Proc) (HKEY,LPCWSTR,DWORD,REGSAM,PHKEY);
 typedef LONG (WINAPI *RegQueryValueExW_Proc) (HKEY,LPCWSTR,LPDWORD,LPDWORD,LPBYTE,LPDWORD);
 typedef DWORD (WINAPI *ExpandEnvironmentStringsW_Proc) (LPCWSTR,LPWSTR,DWORD);
+typedef LANGID (WINAPI *GetUserDefaultUILanguage_Proc) (void);
 
   /* ** A utility function ** */
 static BOOL
@@ -1489,6 +1491,28 @@ expand_environment_strings_w (LPCWSTR lpSrc, LPWSTR lpDst, DWORD nSize)
   return s_pfn_Expand_Environment_Strings_w (lpSrc, lpDst, nSize);
 }
 
+static LANGID WINAPI
+get_user_default_ui_language (void)
+{
+  static GetUserDefaultUILanguage_Proc s_pfn_GetUserDefaultUILanguage = NULL;
+  HMODULE hm_kernel32 = NULL;
+
+  if (is_windows_9x () == TRUE)
+    return 0;
+
+  if (g_b_init_get_user_default_ui_language == 0)
+    {
+      g_b_init_get_user_default_ui_language = 1;
+      hm_kernel32 = LoadLibrary ("Kernel32.dll");
+      if (hm_kernel32)
+	s_pfn_GetUserDefaultUILanguage = (GetUserDefaultUILanguage_Proc)
+	  get_proc_addr (hm_kernel32, "GetUserDefaultUILanguage");
+    }
+  if (s_pfn_GetUserDefaultUILanguage == NULL)
+    return 0;
+  return s_pfn_GetUserDefaultUILanguage ();
+}
+
 
 
 /* Return 1 if P is a valid pointer to an object of size SIZE.  Return
@@ -2947,6 +2971,32 @@ init_environment (char ** argv)
                      LOCALE_SABBREVLANGNAME | LOCALE_USE_CP_ACP,
                      locale_name, sizeof (locale_name)))
     {
+      /* Microsoft are migrating away of locale IDs, replacing them
+	 with locale names, such as "en-US", and are therefore
+	 deprecating the APIs which use LCID etc.  As part of that
+	 deprecation, they don't bother inventing LCID and LANGID
+	 codes for new locales and language/culture combinations;
+	 instead, those get LCID of 0xC000 and LANGID of 0x2000, for
+	 which the LCID/LANGID oriented APIs return "ZZZ" as the
+	 "language name".  Such "language name" is useless for our
+	 purposes.  So we instead use the default UI language, in the
+	 hope of getting something usable.  */
+      if (strcmp (locale_name, "ZZZ") == 0)
+	{
+	  LANGID lang_id = get_user_default_ui_language ();
+
+	  if (lang_id != 0)
+	    {
+	      /* Disregard the sorting order differences between cultures.  */
+	      LCID def_lcid = MAKELCID (lang_id, SORT_DEFAULT);
+	      char locale_name_def[32];
+
+	      if (GetLocaleInfo (def_lcid,
+				 LOCALE_SABBREVLANGNAME | LOCALE_USE_CP_ACP,
+				 locale_name_def, sizeof (locale_name_def)))
+		strcpy (locale_name, locale_name_def);
+	    }
+	}
       for (i = 0; i < N_ENV_VARS; i++)
         {
           if (strcmp (env_vars[i].name, "LANG") == 0)
@@ -10580,6 +10630,7 @@ globals_of_w32 (void)
   g_b_init_expand_environment_strings_w = 0;
   g_b_init_compare_string_w = 0;
   g_b_init_debug_break_process = 0;
+  g_b_init_get_user_default_ui_language = 0;
   num_of_processors = 0;
   /* The following sets a handler for shutdown notifications for
      console apps. This actually applies to Emacs in both console and