Fix handling of plus character in mailto: links (#1490510)

CHANGELOG

@@ -44,6 +44,7 @@ CHANGELOG Roundcube Webmail
 - Fix "washing" of style elements wrapped into many lines
 - Fix so input field (e.g. search box) does not loose focus on list load (#1490455)
 - Fix so css of one html part does not apply to other text parts on message display (#1490505)
+- Fix handling of plus character in mailto: links (#1490510)
 
 RELEASE 1.1.2
 -------------

program/steps/mail/compose.inc

@@ -317,7 +317,8 @@ function rcmail_process_compose_params(&$COMPOSE)
         // #1486037: remove "mailto:" prefix
         $COMPOSE['param']['to'] = preg_replace('/^mailto:/i', '', $mailto[0]);
         // #1490346: decode the recipient address
-        $COMPOSE['param']['to'] = urldecode($COMPOSE['param']['to']);
+        // #1490510: use raw encoding for correct "+" character handling as specified in RFC6068
+        $COMPOSE['param']['to'] = rawurldecode($COMPOSE['param']['to']);
 
         // Supported case-insensitive tokens in mailto URL
         $url_tokens = array('to', 'cc', 'bcc', 'reply-to', 'in-reply-to', 'references', 'subject', 'body');