Screens changed to use AbstractClient in ::setCurrent

abstract_client.h

@@ -59,6 +59,7 @@ public:
      * false for Normal, Dialog, Utility and Menu (and Toolbar??? - not yet) TODO
      */
     virtual bool isSpecialWindow() const = 0;
+    virtual bool isActive() const = 0;
 
     // TODO: remove boolean trap
     static bool belongToSameApplication(const AbstractClient* c1, const AbstractClient* c2, bool active_hack = false);

client.h

@@ -351,7 +351,7 @@ public:
 
     const QIcon &icon() const override;
 
-    bool isActive() const;
+    bool isActive() const override;
     void setActive(bool);
 
     virtual int desktop() const;

screens.cpp

@@ -18,6 +18,7 @@ You should have received a copy of the GNU General Public License
 along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *********************************************************************/
 #include "screens.h"
+#include <abstract_client.h>
 #include <client.h>
 #include "cursor.h"
 #include "settings.h"
@@ -131,7 +132,7 @@ void Screens::setCurrent(const QPoint &pos)
     setCurrent(number(pos));
 }
 
-void Screens::setCurrent(const Client *c)
+void Screens::setCurrent(const AbstractClient *c)
 {
     if (!c->isActive()) {
         return;

screens.h

@@ -32,7 +32,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
 namespace KWin
 {
-class Client;
+class AbstractClient;
 
 class KWIN_EXPORT Screens : public QObject
 {
@@ -59,7 +59,7 @@ public:
     * Check whether a client moved completely out of what's considered the current screen,
     * if yes, set a new active screen.
     */
-    void setCurrent(const Client *c);
+    void setCurrent(const AbstractClient *c);
     bool isCurrentFollowsMouse() const;
     void setCurrentFollowsMouse(bool follows);
     virtual QRect geometry(int screen) const = 0;