signal change of stacking order to the effects

REVIEW: 108059

effects.cpp

@@ -131,6 +131,7 @@ EffectsHandlerImpl::EffectsHandlerImpl(Compositor *compositor, Scene *scene)
     connect(ws, SIGNAL(activityAdded(QString)), SIGNAL(activityAdded(QString)));
     connect(ws, SIGNAL(activityRemoved(QString)), SIGNAL(activityRemoved(QString)));
     connect(ws, SIGNAL(currentActivityChanged(QString)), SIGNAL(currentActivityChanged(QString)));
+    connect(ws, SIGNAL(stackingOrderChanged()), SIGNAL(stackingOrderChanged()));
 #ifdef KWIN_BUILD_TABBOX
     connect(ws->tabBox(), SIGNAL(tabBoxAdded(int)), SIGNAL(tabBoxAdded(int)));
     connect(ws->tabBox(), SIGNAL(tabBoxUpdated()), SIGNAL(tabBoxUpdated()));

layers.cpp

@@ -131,6 +131,7 @@ void Workspace::updateStackingOrder(bool propagate_new_clients)
 #endif
     if (changed || propagate_new_clients) {
         propagateClients(propagate_new_clients);
+        emit stackingOrderChanged();
         if (m_compositor) {
             m_compositor->addRepaintFull();
         }

libkwineffects/kwineffects.h

@@ -1157,6 +1157,13 @@ Q_SIGNALS:
      */
     void activityRemoved(const QString &id);
 
+    /**
+     * This signels is emitted when ever the stacking order is change, ie. a window is risen
+     * or lowered
+     * @since 4.10
+     */
+    void stackingOrderChanged();
+
 protected:
     QVector< EffectPair > loaded_effects;
     QHash< QString, KLibrary* > effect_libraries;

workspace.h

@@ -569,6 +569,11 @@ signals:
      * @param id id of the removed activity
      */
     void activityRemoved(const QString &id);
+    /**
+     * This signels is emitted when ever the stacking order is change, ie. a window is risen
+     * or lowered
+     */
+    void stackingOrderChanged();
 
 private:
     void init();