Fix regression where "Open in new window" action didn't work (#7155)

CHANGELOG

@@ -10,6 +10,7 @@ CHANGELOG Roundcube Webmail
 - Password: Make chpass-wrapper.py Python 3 compatible (#7135)
 - Elastic: Fix bug where it was possible to switch editor mode when 'htmleditor' was in 'dont_override' (#7143)
 - Fix so messages in threads with no root aren't displayed separately (#4999)
+- Fix regression where "Open in new window" action didn't work (#7155)
 
 RELEASE 1.4.2
 -------------

program/js/app.js

@@ -811,7 +811,7 @@ function rcube_webmail()
     if (ret === false)
       return false;
 
-    if (obj || this.command_aborted === true)
+    if ((obj && ret !== true) || this.command_aborted === true)
       return false;
 
     return true;