Log Message:
trac: update to 1.2.3

upgrade notes from 1.0 to 1.2.x:

Obsolete Plugins

Trac has added functionality equivalent to the following plugins:

    ​AdminEnumListPlugin
    ​DateFieldPlugin: see the time custom field type
    ​GroupBasedRedirectionPlugin: the default handler can set as a user preference.
    ​LinenoMacro: see WikiProcessors#AvailableProcessors
    ​NeverNotifyUpdaterPlugin: see notification subscribers
    ​QueryUiAssistPlugin: see TracQuery#Filters.
    ​TicketCreationStatusPlugin: see #NewWorkflowActions

The plugins should be removed when upgrading Trac to 1.2.

New workflow actions

The ticket creation step is controlled with a workflow action. The default \ 
workflow has create and create_and_assign actions. The create action will always \ 
be added when upgrading the database. The create_and_assign action will be added \ 
if the workflow has an assigned state. You may want to edit your workflow after \ 
upgrading the database to customize the actions available on the New Ticket \ 
page.
New permissions policy for read-only wiki pages

Since 1.1.2 the read-only attribute of wiki pages is enabled and enforced only \ 
when ReadonlyWikiPolicy is in the list of active permission policies. If [trac] \ 
permission_policy has the default value DefaultPermissionPolicy, \ 
LegacyAttachmentPolicy, then ReadonlyWikiPolicy should be automatically appended \ 
to the list when upgrading the environment:

[trac]
permission_policies = ReadonlyWikiPolicy,
 DefaultPermissionPolicy,
 LegacyAttachmentPolicy

If other permission policies are enabled, trac.ini will need to have \ 
ReadonlyWikiPolicy appended to the list of active permission_policies. See \ 
TracFineGrainedPermissions#ReadonlyWikiPolicy for additional details on the \ 
proper ordering.