Hi,
We created a dedicated link/merge button on the ticket view page.
The function works well, if the agent have ticket edit permission, but we want, the system do not check permission to ticket linking or merging, so all agent can use this function without any permission check.
If the agent do not have ticket edit permission, this happening: click the button, and showing an empty pop-up window.
Modification: (include/staff/ticket-view.inc.php)