Version:           unspecified (using Devel) 
OS:                Linux

I used last trunk version of akonadi/kdepimlibs/kdepim.
When I use "Manage Local Subscription" dialogbox to subscribe collection, signal is emitted so no problem but collection is not added to ETM.

I debug it and I can see that:
in: void EntityTreeModelPrivate::monitoredCollectionAdded( const Akonadi::Collection& collection, const Akonadi::Collection& parent )
{
....

  qDebug()<<" collection :"<<collection;
  if ( !m_mimeChecker.wantedMimeTypes().isEmpty() && !m_mimeChecker.isWantedCollection( collection ) )
    return;

....
}

 m_mimeChecker.wantedMimeTypes() : ("message/rfc822") 
 collection : Collection ID: 17    remote ID: "ddd" 
   name: "" 
   url: KUrl("akonadi:?collection=17") 
   parent: 7 "inbox" 
   resource: "akonadi_maildir_resource_0" 
   rights: 63 
   contents mime type: () 
    CachePolicy:  
   inherit: true 
   interval: -1 
   timeout: -1 
   sync on demand: false 
   local parts: () 
    CollectionStatistics: 
   count: -1 
   unread count: -1 
   size: -1 


=> we can see that when we add collection, "contents mime type: () " is empty
=> it can add it.

So there is a bug here. I think that collection is not fetched.



Reproducible: Didn't try

Steps to Reproduce:
Unsubscribe a collection => you can see this is removed from ETM
Subscribe this collection => it's not added.