MH-related bugfixes.

* mailbox/mbx_default.c (plus_expand): Do not treat the part
between initial + and / as user name.
* mh/mh_format.c (print_fmt_segment): New function.
(print_fmt_string): Correctly handle multi-line inputs.

@@ -268,45 +268,30 @@ user_mailbox_name (const char *user, char **mailbox_name)
 static int
 plus_expand (const char *file, char **buf)
 {
-  char *user = NULL;
-  char *path = NULL;
   char *home;
   const char *folder_dir = mu_folder_directory ();
   int status, len;
-  
-  if ((status = split_shortcut (file, "+=", &path, &user)))
-    return status;
 
-  if (!path)
-    {
-      free (user);
-      return ENOENT;
-    }
-  
-  home = get_homedir (user);
+  home = get_homedir (NULL);
   if (!home)
-    {
-      free (user);
-      free (path);
-      return ENOENT;
-    }
-
+    return ENOENT;
+  
+  file++;
+  
   if (folder_dir[0] == '/' || mu_is_proto (folder_dir))
     {
-      len = strlen (folder_dir) + strlen (path) + 2;
+      len = strlen (folder_dir) + strlen (file) + 2;
       *buf = malloc (len);
-      sprintf (*buf, "%s/%s", folder_dir, path);
+      sprintf (*buf, "%s/%s", folder_dir, file);
     }
   else
     {
-      len = strlen (home) + strlen (folder_dir) + strlen (path) + 3;
+      len = strlen (home) + strlen (folder_dir) + strlen (file) + 3;
       *buf = malloc (len);
-      sprintf (*buf, "%s/%s/%s", home, folder_dir, path);
+      sprintf (*buf, "%s/%s/%s", home, folder_dir, file);
     }
   (*buf)[len-1] = 0;
   
-  free (user);
-  free (path);
   free (home);
   return 0;
 }

@@ -321,10 +321,10 @@ print_string (struct mh_machine *mach, size_t width, char *str)
 }
   
 static void
-print_fmt_string (struct mh_machine *mach, size_t fmtwidth, char *str)
+print_fmt_segment (struct mh_machine *mach, size_t fmtwidth, char *str,
+		   size_t len)
 {
-  size_t len = strlen (str);
-  size_t width = mbslen (str);
+  size_t width = mbsnlen (str, len);
 
   if (fmtwidth && width > fmtwidth)
     {
@@ -346,6 +346,21 @@ print_fmt_string (struct mh_machine *mach, size_t fmtwidth, char *str)
 }
 
 static void
+print_fmt_string (struct mh_machine *mach, size_t fmtwidth, char *str)
+{
+  char *p = strchr (str, '\n');
+  while (p)
+    {
+      print_fmt_segment (mach, fmtwidth, str, p - str + 1);
+      mach->ind = 0;
+      str = p + 1;
+      p = strchr (str, '\n');
+    }
+  if (str[0])
+    print_fmt_segment (mach, fmtwidth, str, strlen (str));
+}
+
+static void
 reset_fmt_defaults (struct mh_machine *mach)
 {
   const char *p;