SVN commit 1007544 by aseigo:

don't show which desktop if Group::desktop() returns 0, as that means "no common desktop"
BUG:198523


 M  +7 -3      taskgroupitem.cpp  


--- trunk/KDE/kdebase/workspace/plasma/applets/tasks/taskgroupitem.cpp #1007543:1007544
@@ -271,9 +271,13 @@
         return;
     }
 
-    Plasma::ToolTipContent data(m_group->name(),
-                                i18nc("Which virtual desktop a window is currently on", "On %1",
-                                       KWindowSystem::desktopName(m_group->desktop())));
+    Plasma::ToolTipContent data(m_group->name(), QString());
+    int desktop = m_group->desktop();
+    if (desktop != 0) {
+        data.setSubText(i18nc("Which virtual desktop a window is currently on", "On %1",
+                        KWindowSystem::desktopName(m_group->desktop())));
+    }
+
     data.setImage(m_group->icon());
 
     int i = 0;