Fix plain text spellchecker icorrect highlighting in non-ASCII text (#1488973)

CHANGELOG

@@ -1,6 +1,7 @@
 CHANGELOG Roundcube Webmail
-========================a===
+===========================
 
+- Fix plain text spellchecker icorrect highlighting in non-ASCII text (#1488973)
 - Add workaround for invalid message charset detection by IMAP servers (#1488968)
 - Fix NUL characters in content-type of ms-tnef attachment (#1488964)
 - Fix regression in handling LDAP contact identifiers (#1488959)

program/lib/Roundcube/rcube_spellchecker.php

@@ -31,7 +31,7 @@ class rcube_spellchecker
     private $lang;
     private $rc;
     private $error;
-    private $separator = '/[\s\r\n\t\(\)\/\[\]{}<>\\"]+|[:;?!,\.]([^\w]|$)/';
+    private $separator = '/[\s\r\n\t\(\)\/\[\]{}<>\\"]+|[:;?!,\.](?=\W|$)/';
     private $options = array();
     private $dict;
     private $have_dict;