diff --git a/src/declarativeimports/core/windowthumbnail.cpp b/src/declarativeimports/core/windowthumbnail.cpp
index b10f0305b..84d8bc865 100644
--- a/src/declarativeimports/core/windowthumbnail.cpp
+++ b/src/declarativeimports/core/windowthumbnail.cpp
@@ -64,6 +64,7 @@ WindowThumbnail::WindowThumbnail(QQuickItem *parent)
     , QAbstractNativeEventFilter()
     , m_xcb(false)
     , m_winId(0)
+    , m_paintedSize(QSizeF())
     , m_damaged(false)
     , m_depth(0)
 #if HAVE_XCB_COMPOSITE
@@ -140,6 +141,16 @@ void WindowThumbnail::setWinId(uint32_t winId)
     emit winIdChanged();
 }
 
+qreal WindowThumbnail::paintedWidth() const
+{
+    return m_paintedSize.width();
+}
+
+qreal WindowThumbnail::paintedHeight() const
+{
+    return m_paintedSize.height();
+}
+
 QSGNode *WindowThumbnail::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData *updatePaintNodeData)
 {
     Q_UNUSED(updatePaintNodeData)
@@ -154,7 +165,11 @@ QSGNode *WindowThumbnail::updatePaintNode(QSGNode *oldNode, UpdatePaintNodeData
         windowToTexture(node);
     }
     node->setRect(boundingRect());
-    const QSize size(node->texture()->textureSize().scaled(boundingRect().size().toSize(), Qt::KeepAspectRatio));
+    const QSizeF size(node->texture()->textureSize().scaled(boundingRect().size().toSize(), Qt::KeepAspectRatio));
+    if (size != m_paintedSize) {
+        m_paintedSize = size;
+        emit paintedSizeChanged();
+    }
     const qreal x = boundingRect().x() + (boundingRect().width() - size.width()) / 2;
     const qreal y = boundingRect().y() + (boundingRect().height() - size.height()) / 2;
     node->setRect(QRectF(QPointF(x, y), size));
diff --git a/src/declarativeimports/core/windowthumbnail.h b/src/declarativeimports/core/windowthumbnail.h
index 14fc44a3b..61bc156b0 100644
--- a/src/declarativeimports/core/windowthumbnail.h
+++ b/src/declarativeimports/core/windowthumbnail.h
@@ -73,6 +73,9 @@ class WindowThumbnail : public QQuickItem, public QAbstractNativeEventFilter
 {
     Q_OBJECT
     Q_PROPERTY(uint winId READ winId WRITE setWinId NOTIFY winIdChanged)
+    Q_PROPERTY(qreal paintedWidth READ paintedWidth NOTIFY paintedSizeChanged)
+    Q_PROPERTY(qreal paintedHeight READ paintedHeight NOTIFY paintedSizeChanged)
+
 public:
     WindowThumbnail(QQuickItem *parent = 0);
     virtual ~WindowThumbnail();
@@ -82,8 +85,12 @@ public:
     uint32_t winId() const;
     void setWinId(uint32_t winId);
 
+    qreal paintedWidth() const;
+    qreal paintedHeight() const;
+
 Q_SIGNALS:
     void winIdChanged();
+    void paintedSizeChanged();
 
 private:
     void iconToTexture(WindowTextureNode *textureNode);
@@ -94,6 +101,7 @@ private:
     void discardPixmap();
     bool m_xcb;
     uint32_t m_winId;
+    QSizeF m_paintedSize;
     bool m_damaged;
     int m_depth;
 #if HAVE_XCB_COMPOSITE