== Enhancing VirtualTicketPermissionsPlugin ==

I did some work on the VirtualTicketPermissionsPlugin.

See ticket #xxx for patch and progress.

=== Overview of the new features ===

 * in addition to the ''group_blacklist'', in section {{{[virtualticketpermissions]}}},
   you can also write a '''group_whitelist''' setting.
   * only groups on the whitelist will be considered for the TICKET_IS_..._GROUP
     permissions
   * the blacklist, if also configured, still works
   * both whitelist and blacklist entries '''can be regular expressions'''
     (each list will be regex-compiled once on component init for performance)
 * group names can be mixed-case in addition to the already supported all-lower-case;
   only complete-upper-case stuff, i.e. PERMISSIONS_PROPER, are excluded
 * for '''all''' of the ''TICKET_IS_XXX'' permissions provided by the module,
   there is now a corresponding '''TICKET_IS_NOT_XXX''' negating the test.
   This permits writing mutually exclusive workflow steps, like this:
{{{
reassign = assigned,accepted,started -> assigned
reassign.operations = set_owner
reassign.permissions = TICKET_IS_OWNER_GROUP

takeover = assigned,accepted,started -> assigned
takeover.operations = set_owner_to_self
takeover.permissions = TICKET_IS_NOT_OWNER_GROUP
OUP
}}}
   A single user will either see reassign (when they share a group with the current owner),
   or ''takeover'', but never both (unless they are TRAC_ADMIN, which seems to not call down
   to the plugin at all, unfortunately)