Introduce new getter method screenEdgeWindows() to class ScreenEdge

A new getter method screenEdgeWindows() is provided by class ScreenEdge
since the screen edge windows are needed in class Workspace in the function
propagateClients() which is implemented in layers.cpp

screenedge.cpp

@@ -375,4 +375,16 @@ void ScreenEdge::raiseElectricBorderWindows()
     XRestackWindows(display(), windows, pos);
     delete [] windows;
 }
+
+QVector< Window* >* ScreenEdge::screenEdgeWindows()
+{
+    QVector< Window* >* screenEdgeWindows = new QVector< Window* >();
+    for (int i = 0; i <= ELECTRIC_COUNT; ++i) {
+        if (electric_windows[i] != None) {
+            screenEdgeWindows->append((Window*)electric_windows[i]);
+        }
+    }
+    return screenEdgeWindows;
+}
 } //namespace
+

screenedge.h

@@ -29,6 +29,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #ifndef KWIN_SCREENEDGE_H
 #define KWIN_SCREENEDGE_H
 #include <QtCore/QObject>
+#include <QtCore/QVector>
 #include "kwinglobals.h"
 
 
@@ -55,6 +56,7 @@ public:
     void raiseElectricBorderWindows();
     void destroyElectricBorders();
     bool electricBorderEvent(XEvent * e);
+    QVector< Window* >* screenEdgeWindows();
 public Q_SLOTS:
     void updateElectricBorders();
 private: