Support Closeable in TabBox

Needed by window strip to not add a close button to non-closeable
windows such as the desktop shell.

tabbox/clientmodel.cpp

@@ -43,6 +43,7 @@ ClientModel::ClientModel(QObject* parent)
     roles[DesktopNameRole] = "desktopName";
     roles[MinimizedRole] = "minimized";
     roles[WIdRole] = "windowId";
+    roles[CloseableRole] = "closeable";
     setRoleNames(roles);
 }
 
@@ -80,6 +81,8 @@ QVariant ClientModel::data(const QModelIndex& index, int role) const
         return qulonglong(m_clientList[ clientIndex ]->window());
     case MinimizedRole:
         return m_clientList[ clientIndex ]->isMinimized();
+    case CloseableRole:
+        return m_clientList[ clientIndex ]->isCloseable();
     default:
         return QVariant();
     }

tabbox/clientmodel.h

@@ -54,7 +54,8 @@ public:
         IconRole = Qt::UserRole + 3, // TODO: to be removed
         EmptyRole = Qt::UserRole + 4, ///< Indicates if the model contains TabBoxClients
         WIdRole = Qt::UserRole + 5, ///< The window ID of TabBoxClient
-        MinimizedRole = Qt::UserRole + 6 ///< TabBoxClient is minimized
+        MinimizedRole = Qt::UserRole + 6, ///< TabBoxClient is minimized
+        CloseableRole = Qt::UserRole + 7 ///< TabBoxClient can be closed
     };
     ClientModel(QObject* parent = 0);
     ~ClientModel();

tabbox/qml/window_strip.qml

@@ -105,7 +105,7 @@ Item {
                 prefix: "shadow"
                 width: closeButton.width + margins.left + margins.right
                 height: closeButton.height + margins.top + margins.bottom
-                visible: true//model["actionClose"] && (model["className"] != shellName)
+                visible: closeable
                 anchors {
                     top: parent.top
                     right: parent.right

tabbox/tabbox.cpp

@@ -270,6 +270,11 @@ int TabBoxClientImpl::height() const
     return m_client->height();
 }
 
+bool TabBoxClientImpl::isCloseable() const
+{
+    return m_client->isCloseable();
+}
+
 
 /*********************************************************
 * TabBox

tabbox/tabbox.h

@@ -80,6 +80,7 @@ public:
     virtual int y() const;
     virtual int width() const;
     virtual int height() const;
+    virtual bool isCloseable() const;
 
     Client* client() const {
         return m_client;

tabbox/tabboxhandler.h

@@ -384,6 +384,7 @@ public:
     virtual int y() const = 0;
     virtual int width() const = 0;
     virtual int height() const = 0;
+    virtual bool isCloseable() const = 0;
 };
 
 /**