Send an alert to assigned staff/team on an internal note even when a ticket is
closed.

Consider closed date to determine ticket's last activity date. The net effect is closed tickets queue will be sorted by closed date.

Add department setting to limit ticket assignment within department to
department members only. This is necessary for departments with strict
policy on who can access tickets.

The setting doesn't limit team assignment or auto-assignment via help topics
and ticket filters.

Previously, the new internal note alert was only sent to the assigned staff
member, if any were assigned.

Provide quick prints options that bypasses the print dialog modal

Disable email alert sent to admin when a warning is logged due to ticket
rejection e.g when banned email or max open limit is reached.

Images placed in the "Issue Details" in a new ticket by staff are not
correctly translated to the standard used in the storage model in the
%ticket_thread table nor for the standard used by the email system.

This patch changes the logic used to create the email template to fetch the
sanitized and converted message body from the ThreadEntry instance created
rather than reusing the raw message originally sent in the request.

References:
https://github.com/osTicket/osTicket-1.8/issues/816

This stems from a confusing similarity between the + operator for arrays
and array_merge() in php. Adding arrays will ignore items in the RHS where
keys are present in the LHS. Therefore, when adding numerically indexed
arrays together, only items on the RHS that have a key higher than the
greatest key on the LHS will be included.

  * Administrator can disable the new activity alert
  * Administrator can disable automatic collaborators from email headers

When checking ticket access - only consider assignment IF the ticket is
open. This is required since staff_id field is overloaded to show who closed
the ticket.

Staff uploaded files, on new ticket, were getting attached to message instead of
response.

If a staff member creates a new ticket and cancels the user-lookup /
create-new-user dialog, and the contact information form has a required field
other than the name and email address fields, the ticket cannot be created
because the required fields for new clients are not shown and can therefore
not have a required value.

This patch allows new clients to be created without the required fields when
the ticket is created by staff members.

When checking ticket access - only consider assignment IF the ticket is
open. This is required since staff_id field is overloaded to show who closed
the ticket.

Background: osTicket allows access to assigned open tickets (both personal
and team assignments) regardless of the assigned department or group. This
is necessary to allow staff to work on tickets in an otherwise restricted
department.

When a staff member closes a ticket, they're credited (ticket.staff_id is
set to staff's id) for the purpose of showing who closed the ticket.
osTicket mistakenly allowed continued access to closed tickets even when the
staff doesn't have access to the ticket based on departmental access.

email.

This is necessary to eliminate possible loop when an email is sent to a
virtual/aliased address. Not all mail servers add delivered-to header!

If a ticket is created via email for an existing user, under some
circumstances, no user will be associated with the new ticket.

This approach will help detect responses to the ticket thread from mail
clients which do not include the References and In-Reply-To MIME headers.
This also allows the Subject line to continue to omit the ticket number.

The priority setting was broken when priority was added to the dynamic data

necessary to avoid adding internal virtual address as a collaborator.

Store delivered-to email ID - giving us the ability to reply FROM specific
email address as opposed to the department's email.

This is required when validating a message which could be a string or an
object.