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Wagtail 1.4 release notes - IN DEVELOPMENT
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What's new
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Custom document models
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The `Document` model can now be overridden using the new `WAGTAILDOCS_DOCUMENT_MODEL` setting. This works in the same way that `WAGTAILIMAGES_IMAGE_MODEL` works for `Image`.

Minor features
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 * Snippets now support a custom ``edit_handler`` property; this can be used to implement a tabbed interface, for example. See :ref:`customising_the_tabbed_interface` (Mikalai Radchuk)
 * Date/time pickers now respect the locale's 'first day of week' setting (Peter Quade)
 * Refactored the way forms are constructed for the page editor, to allow custom forms to be used
 * Notification message on publish now indicates whether the page is being published now or scheduled for publication in future (Chris Rogers)


Bug fixes
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 * Custom page managers no longer raise an error when used on an abstract model
 * Wagtail's migrations are now all reversible (benjaoming)
 * Deleting a page content type now preserves existing pages as basic Page instances, to prevent tree corruption
 * The ``Page.path`` field is now explicitly given the "C" collation on PostgreSQL to prevent tree ordering issues when using a database created with the Slovak locale
 * Wagtail's compiled static assets are now put into the correct directory on Windows (Aarni Koskela)
 * ``ChooserBlock`` now correctly handles models with primary keys other than ``id`` (alexpilot11)
 * Fixed typo in Wistia oEmbed pattern (Josh Hurd)
 * Added more accurate help text for the Administrator flag on user accounts (Matt Fozard)
 * Tags added on the multiple image uploader are now saved correctly
 * Documents created by a user are no longer deleted when the user is deleted
 * Fixed a crash in ``RedirectMiddleware`` when a middleware class before ``SiteMiddleware`` returns a response (Josh Schneier)


Upgrade considerations
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