Introduce member variable ScreenEdge to Workspace

This commit adds a new member variable m_screenEdge to Workspace. It is
initialized in the constructor and deleted in the deconstructor.
A getter is introduced as well.

workspace.cpp

@@ -58,6 +58,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "scene.h"
 #include "deleted.h"
 #include "effects.h"
+#include "screenedge.h"
 #include "tilinglayout.h"
 
 #include "scripting/scripting.h"
@@ -2391,6 +2392,12 @@ Outline* Workspace::outline()
     return m_outline;
 }
 
+ScreenEdge* Workspace::screenEdge()
+{
+    return &m_screenEdge;
+}
+
+
 } // namespace
 
 #include "workspace.moc"

workspace.h

@@ -38,6 +38,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #include "utils.h"
 #include "kdecoration.h"
 #include "kdecorationfactory.h"
+#include "screenedge.h"
 #include "sm.h"
 
 #include <X11/Xlib.h>
@@ -220,6 +221,7 @@ public:
     Position supportedTilingResizeMode(Client *c, Position currentMode);
 
     Outline* outline();
+    ScreenEdge* screenEdge();
 
     //-------------------------------------------------
     // Desktop layout
@@ -330,6 +332,7 @@ private:
     QVector<TilingLayout *> tilingLayouts;
 
     Outline* m_outline;
+    ScreenEdge m_screenEdge;
 
     //-------------------------------------------------
     // Unsorted