Add keybinding for show desktop.

No shortcut is set by default. Thanks to Alexander (alex3255) for providing the patch.
FEATURE: 182729

svn path=/trunk/KDE/kdebase/workspace/; revision=1022596

kwinbindings.cpp

@@ -153,6 +153,7 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
     DEF( I18N_NOOP("Window to Screen 6"),               0, slotWindowToScreen6() );
     DEF( I18N_NOOP("Window to Screen 7"),               0, slotWindowToScreen7() );
     DEF( I18N_NOOP("Window to Next Screen"),            0, slotWindowToNextScreen() );
+    DEF( I18N_NOOP("Show Desktop"),                     0, slotToggleShowDesktop() );
 
     a = actionCollection->addAction( "Group:Desktop Switching" );
     a->setText( i18n("Desktop Switching") );

useractions.cpp

@@ -1034,6 +1034,14 @@ void Workspace::slotSetupWindowShortcut()
         performWindowOperation( c, Options::SetupWindowShortcutOp );
     }
 
+/*!
+  Toggles show desktop
+ */
+void Workspace::slotToggleShowDesktop()
+    {
+    setShowingDesktop( !showingDesktop() );
+    }
+
 /*!
   Move window to next desktop
  */

workspace.h

@@ -546,6 +546,7 @@ class Workspace : public QObject, public KDecorationDefines
         void slotWindowToScreen7() { return slotWindowToScreen( 7 ); }
         void slotSwitchToNextScreen();
         void slotWindowToNextScreen();
+        void slotToggleShowDesktop();
 
         void slotWindowMaximize();
         void slotWindowMaximizeVertical();