Introduce new signal configChanged() to Workspace

To get rid of direct method calls and numerous #ifdefs a new signal
configChanged() is introduced to class Workspace. Every module
which is interested in reloading the configuration is needed to connect to
this signal.
Initially this is done for the reconfiguration of DesktopChangeOSD().

desktopchangeosd.cpp

@@ -65,6 +65,7 @@ DesktopChangeOSD::DesktopChangeOSD(Workspace* ws)
     connect(&m_delayedHideTimer, SIGNAL(timeout()), this, SLOT(hide()));
     connect(ws, SIGNAL(currentDesktopChanged(int)), this, SLOT(desktopChanged(int)));
     connect(ws, SIGNAL(numberDesktopsChanged(int)), this, SLOT(numberDesktopsChanged()));
+    connect(ws, SIGNAL(configChanged()), this, SLOT(reconfigure()));
 
     m_scene = new QGraphicsScene(0);
     setScene(m_scene);

desktopchangeosd.h

@@ -70,8 +70,6 @@ public:
     DesktopChangeOSD(Workspace* ws);
     ~DesktopChangeOSD();
 
-    void reconfigure();
-
     inline Plasma::FrameSvg* itemFrame() {
         return &m_item_frame;
     };
@@ -98,6 +96,7 @@ private:
 private Q_SLOTS:
     void desktopChanged(int old);
     void numberDesktopsChanged();
+    void reconfigure();
 };
 
 class DesktopChangeItem : public QObject, public QGraphicsItem

workspace.cpp

@@ -933,9 +933,7 @@ void Workspace::slotReconfigure()
 #ifdef KWIN_BUILD_TABBOX
     tab_box->reconfigure();
 #endif
-#ifdef KWIN_BUILD_DESKTOPCHANGEOSD
-    desktop_change_osd->reconfigure();
-#endif
+    emit configChanged();
     initPositioning->reinitCascading(0);
     discardPopup();
     forEachClient(CheckIgnoreFocusStealingProcedure());

workspace.h

@@ -718,6 +718,7 @@ signals:
                       Qt::MouseButtons buttons, Qt::MouseButtons oldbuttons,
                       Qt::KeyboardModifiers modifiers, Qt::KeyboardModifiers oldmodifiers);
     void propertyNotify(long a);
+    void configChanged();
 
 private:
     void init();