Zabbix

..F....... [ZBX-20809] fixed browser errors when closing stacked popups

Merge in ZBX/zabbix from feature/ZBX-20809-6.0 to release/6.0

* commit 'ba6ce3ff24258a4f81b20b2f0f348e8ff5b813f9':
  ..F....... [ZBX-20809] fixed browser errors when closing stacked popups