"New Desktop" in to Desktop menu

Adding a new desktop entry to create a new desktop and move the
selected window there.

REVIEW: 104781

useractions.cpp

@@ -497,6 +497,13 @@ void Workspace::desktopPopupAboutToShow()
                 !active_popup_client->isOnAllDesktops() && active_popup_client->desktop()  == i)
             action->setChecked(true);
     }
+
+    desk_popup->addSeparator();
+    action = desk_popup->addAction(i18nc("Create a new desktop and move there the window", "&New Desktop"));
+    action->setData(numberOfDesktops() + 1);
+
+    if (numberOfDesktops() >= Workspace::self()->maxNumberOfDesktops())
+        action->setEnabled(false);
 }
 
 /*!
@@ -1435,6 +1442,8 @@ void Workspace::slotSendToDesktop(QAction *action)
         // the 'on_all_desktops' menu entry
         active_popup_client->setOnAllDesktops(!active_popup_client->isOnAllDesktops());
         return;
+    } else if (desk > numberOfDesktops()) {
+        setNumberOfDesktops(desk);
     }
 
     sendClientToDesktop(active_popup_client, desk, false);

workspace.cpp

@@ -1422,6 +1422,11 @@ bool Workspace::setCurrentDesktop(int new_desktop)
     return true;
 }
 
+int Workspace::maxNumberOfDesktops() const
+{
+    return KWIN_MAX_NUMBER_DESKTOPS;
+}
+
 #ifdef KWIN_BUILD_ACTIVITIES
 
 //BEGIN threaded activity list fetching

workspace.h

@@ -214,6 +214,10 @@ public:
      * @returns Total number of desktops currently in existence.
      */
     int numberOfDesktops() const;
+    /**
+     * @returns The maximum number of desktops that KWin supports.
+     */
+    int maxNumberOfDesktops() const;
     /**
      * Set the number of available desktops to @a count. This function overrides any previous
      * grid layout.