Moving getStatus is not complete... you did not move all associated protected methods such as _isLocked that is delegating to an helper that maybe should be moved too...

(I already wrote this above )

Important drawback:

The ContentTool and the OldContentTool save the current content as a member to easily resend bus message.
This was not an issue before because most buttons were asking server... but now they believe in the message that can be wrong since the content continue to live.
Keeping a content is a dangerous idea... for the OldContentTool this is not useful and should be simply removed...
For the ContentTool, this is usefull when navigating in the edition form... so we should listen for events to replace this class member each time we hear about a content and/or clear the attribute when after bluring the tool

I think that the _getStatus method of SmartClientSideElement is not used directly anymore except by inheritance by DeleteContentClientSideElement (cms & web)... we should move java code to theses classes (and the associated helper?)

A migration guide is necessary for migration

Once this will be push, the following plugins have to be marked as incompatible : Blog, Content IO, ODF, Thesaurus and User directory.

We have to consider deliver a new versions of these plugins if necessary BEFORE commiting this

There is a patch only for the Intranet template, while we have 4 other templates

Here is the list of buttons to tests since they are impacted in a way or another 

CMS
org.ametys.cms.referencetable.Delete (Ametys.plugins.cms.content.controller.DeleteContentController)
org.ametys.cms.content.Delete (Ametys.plugins.cms.content.controller.DeleteContentController)
org.ametys.cms.hierarchical.referencetable.contents.DeleteCandidate (Ametys.plugins.cms.content.controller.DeleteContentController)
org.ametys.cms.content.PasteContentValues (Ametys.plugins.cms.content.controller.PasteContentValuesController)
org.ametys.cms.content.Edit
org.ametys.cms.referencetable.Edit
org.ametys.cms.Unlock

WEB
org.ametys.web.content.Delete (Ametys.plugins.cms.content.controller.DeleteContentController)
org.ametys.web.contentprivacy (Ametys.plugins.web.content.controller.ContentPrivacyController)
org.ametys.web.userinterface.Tag
org.ametys.web.page.Visibility
org.ametys.web.linkpage
org.ametys.web.blankpage
org.ametys.web.preview
org.ametys.web.livepreview
org.ametys.web.page.notify
org.ametys.web.publication.schedule

BLOG
org.ametys.plugins.blog.workflow.Edit
org.ametys.plugins.blog.Tag

NEWSLETTER
org.ametys.newsletter.workflow.Edit

ODF
org.ametys.odf.content.Delete (Ametys.plugins.cms.content.controller.DeleteContentController)
org.ametys.odf.content.person.Delete (Ametys.plugins.cms.content.controller.DeleteContentController)
org.ametys.odf.content.EditCatalog (Ametys.plugins.odf.content.controller.EditCatalogContentController)
org.ametys.odf.content.PasteContent (Ametys.plugins.odf.content.controller.PasteODFContentController)
org.ametys.odf.content.program.Edit
org.ametys.odf.content.container.Edit
org.ametys.odf.content.courseList.Edit
org.ametys.odf.content.course.Edit
org.ametys.odf.content.person.Edit
org.ametys.odf.content.orgunit.Edit

ODF Pilotage
org.ametys.odf.content.Delete (Ametys.plugins.odf.pilotage.controller.DeleteODFPilotageContentController)
org.ametys.plugins.odfpilotage.mention.Validate (Ametys.plugins.odf.pilotage.controller.PilotageStatusButtonController)
org.ametys.plugins.odfpilotage.orgunit.Validate (Ametys.plugins.odf.pilotage.controller.PilotageStatusButtonController)
org.ametys.plugins.odfpilotage.cfvu.Validate (Ametys.plugins.odf.pilotage.controller.PilotageStatusButtonController)
org.ametys.plugins.odfpilotage.cfvu.mcc.Validate (Ametys.plugins.odf.pilotage.controller.PilotageStatusButtonController)
org.ametys.odf.content.EditCatalog (Ametys.plugins.odf.pilotage.controller.EditODFPilotageCatalogContentController)
org.ametys.odf.content.PasteContent (Ametys.plugins.odf.pilotage.controller.PasteODFPilotageContentController)

ODF Sync
org.ametys.plugins.odfsync.apogee.SynchronizeProgram
org.ametys.plugins.odfsync.apogee.SynchronizeSubProgram
org.ametys.plugins.odfsync.apogee.SynchronizeContainer
org.ametys.plugins.odfsync.apogee.SynchronizeCourseList
org.ametys.plugins.odfsync.apogee.SynchronizeCourse
org.ametys.plugins.odfsync.apogee.SynchronizeOrgUnit
org.ametys.plugins.odfsync.SynchronizePerson

Thesaurus
org.ametys.plugins.thesaurus.EditTerm
org.ametys.plugins.thesaurus.DeleteTerm

User Directory
org.ametys.plugins.userdirectory.orgunit.Delete (Ametys.plugins.cms.content.controller.DeleteContentController)

Template
org.ametys.web.workflow.Unpublish
org.ametys.web.workflow.Archive
org.ametys.web.workflow.ArchiveMenu (Ametys.plugins.cms.content.controller.ArchiveMenu)
org.ametys.cms.default.AddContentType (Ametys.plugins.cms.content.controller.ContentTypeGalleryController)
org.ametys.cms.default.AddMixin (Ametys.plugins.cms.content.controller.MixinGalleryController)
org.ametys.web.workflow.Restore (Ametys.plugins.cms.content.controller.OldContentController)
org.ametys.odf.program.workflow.ArchiveMenu (Ametys.plugins.cms.content.controller.ArchiveMenu)

List of changes in plugin.xml :

org.ametys.web.clientsideelement.DeleteContentClientSideElement -> org.ametys.cms.clientsideelement.SmartContentClientSideElement
org.ametys.web.clientsideelement.TagClientSideElement -> org.ametys.core.ui.StaticClientSideElement
org.ametys.cms.clientsideelement.ArchiveMenuClientSideElement -> org.ametys.cms.clientsideelement.SmartContentMenu
org.ametys.web.clientsideelement.PageVisibilityClientSideElement -> org.ametys.core.ui.StaticClientSideElement
org.ametys.web.clientsideelement.PreviewPageClientSideElement -> org.ametys.core.ui.StaticClientSideElement
org.ametys.web.clientsideelement.LivePageClientSideElement -> org.ametys.core.ui.StaticClientSideElement
org.ametys.web.clientsideelement.BlankPageClientSideElement -> org.ametys.core.ui.StaticClientSideElement
org.ametys.web.clientsideelement.LinkPageClientSideElement -> org.ametys.core.ui.SimpleMenu
org.ametys.cms.clientsideelement.SmartContentTypesGallery -> org.ametys.cms.clientsideelement.ContentTypesGallery

Special cases :

org.ametys.cms.clientsideelement.DeleteContentClientSideElement -> org.ametys.cms.clientsideelement.SmartContentClientSideElement (in ODF it becomes Ametys.plugins.odf.content.controller.DeleteCatalogContentController for content)

Ametys.plugins.cms.content.controller.DeleteContentController ->
   Ametys.plugins.web.content.controller.DeleteContentController
or Ametys.plugins.cms.content.controller.SmartContentController
or Ametys.plugins.odf.content.controller.DeleteCatalogContentController

(check the java code to find if it is a org.ametys.cms.clientsideelement.SmartContentClientSideElement or another implementation which still require server code)

Ametys.plugins.web.page.controller.LivePageController -> Ametys.plugins.web.page.controller.PreviewPageController (only if it is a preview and not a live preview. If it is about a live preview, there is no change)