Remove config from kmail2rc when we delete folder

kmkernel.cpp

@@ -177,7 +177,7 @@ KMKernel::KMKernel (QObject *parent, const char *name) :
   mFolderCollectionMonitor = new FolderCollectionMonitor( this );
 
   connect( mFolderCollectionMonitor->monitor(), SIGNAL(collectionMoved(Akonadi::Collection,Akonadi::Collection,Akonadi::Collection)), SLOT(slotCollectionMoved(Akonadi::Collection,Akonadi::Collection,Akonadi::Collection)) );
-
+  connect( mFolderCollectionMonitor->monitor(), SIGNAL(collectionRemoved(Akonadi::Collection)), SLOT(slotCollectionRemoved(Akonadi::Collection)));
 
   Akonadi::Session *session = new Akonadi::Session( "KMail Kernel ETM", this );
   folderCollectionMonitor()->setSession( session );
@@ -1751,6 +1751,13 @@ void KMKernel::stopAgentInstance()
   }
 }
 
+void KMKernel::slotCollectionRemoved(const Akonadi::Collection& col)
+{
+  KConfigGroup group( KMKernel::config(), MailCommon::FolderCollection::configGroupName( col ) );
+  group.deleteGroup();
+  group.sync();
+}
+
 void KMKernel::slotCollectionMoved( const Akonadi::Collection &collection, const Akonadi::Collection &source, const Akonadi::Collection &destination )
 {
   //TODO add undo/redo move collection

kmkernel.h

@@ -440,7 +440,6 @@ public slots:
   void slotRunBackgroundTasks();
 
   void slotConfigChanged();
-  void slotCollectionMoved( const Akonadi::Collection &collection, const Akonadi::Collection &source, const Akonadi::Collection &destination );
 
 signals:
   void configChanged();
@@ -464,6 +463,9 @@ private slots:
   void akonadiStateChanged( Akonadi::ServerManager::State );
   void slotProgressItemCompletedOrCanceled( KPIM::ProgressItem * item);
   void instanceError(const Akonadi::AgentInstance& instance, const QString & message);
+  void slotCollectionMoved( const Akonadi::Collection &collection, const Akonadi::Collection &source, const Akonadi::Collection &destination );
+  void slotCollectionRemoved(const Akonadi::Collection& col);
+
 private:
   void migrateFromKMail1();
   void openReader( bool onlyCheck );