Bug 131248

Version:           1.9.3 (using KDE KDE 3.5.3)
Installed from:    Unspecified

The DCOP signal "unreadCountChanged" is not really supported by KMail :(

For one there is the DCOP-Signal
  void unreadCountChanged( const QString& folderURL, int numUnread );
declared in KMailIface, but never emitted in KMail. Too sad, it would be nice
to get all important data by push instead having to retrieve/pull it (which also brings quite some overhead).

Even worse, "unreadCountChanged()" without arguments gets emitted only 
in  "slotMailChecked(...)". But not e.g. when an unread email gets selected 
and thus turns to "read".

It works for the Kontact summary plugin, because the summary is only shown if 
no other part like the KMail one is in front. And when one switches back to 
the summary all the summary plugins are asked to update. There even seems to 
special support for this with the "timeOfLastMessageCountChange()" DCOP 
method in KMail.
BTW: If KMail is running separately the summary plugin fails of course, too!

See also this thread on kde-pim: http://lists.kde.org/?l=kde-pim&m=115359115719917&w=2