add a generic contextChanged signal (need to do an API review on this class next week once we have more of the nepomuk stuff together)

svn path=/trunk/KDE/kdebase/workspace/libs/plasma/; revision=857494

context.cpp

@@ -57,6 +57,7 @@ void Context::setCurrentActivity(const QString &name)
 
     d->activity = name;
     emit activityChanged(this);
+    emit contextChanged(this);
 
     QStringList activities = listActivities();
     if (!activities.contains(name)) {

context.h

@@ -47,6 +47,7 @@ public:
     //TODO: location
 
 Q_SIGNALS:
+    void contextChanged(Plasma::Context *context);
     void activityChanged(Plasma::Context *context);
     void locationChanged(Plasma::Context *context);