diff --git a/src/x11window.cpp b/src/x11window.cpp
index 970272b88c..f821bede90 100644
--- a/src/x11window.cpp
+++ b/src/x11window.cpp
@@ -1279,7 +1279,6 @@ void X11Window::setClientFrameExtents(const NETStrut &strut)
         return;
     }
 
-    const bool wasClientSideDecorated = isClientSideDecorated();
     m_clientFrameExtents = clientFrameExtents;
 
     // We should resize the client when its custom frame extents are changed so
@@ -1289,10 +1288,6 @@ void X11Window::setClientFrameExtents(const NETStrut &strut)
     // cannot be shaded, therefore it's okay not to use the adjusted size here.
     moveResize(moveResizeGeometry());
 
-    if (wasClientSideDecorated != isClientSideDecorated()) {
-        Q_EMIT clientSideDecoratedChanged();
-    }
-
     // This will invalidate the window quads cache.
     Q_EMIT geometryShapeChanged(this, frameGeometry());
 }
diff --git a/src/x11window.h b/src/x11window.h
index 17a10fc8b2..154ac817c1 100644
--- a/src/x11window.h
+++ b/src/x11window.h
@@ -87,11 +87,6 @@ class KWIN_EXPORT X11Window : public Window
      * Use with care!
      */
     Q_PROPERTY(bool blocksCompositing READ isBlockingCompositing WRITE setBlockingCompositing NOTIFY blockingCompositingChanged)
-    /**
-     * Whether the Client uses client side window decorations.
-     * Only GTK+ are detected.
-     */
-    Q_PROPERTY(bool clientSideDecorated READ isClientSideDecorated NOTIFY clientSideDecoratedChanged)
     Q_PROPERTY(qulonglong frameId READ frameId CONSTANT)
     Q_PROPERTY(qulonglong windowId READ window CONSTANT)
 public:
@@ -359,33 +354,11 @@ protected:
     void moveResizeInternal(const QRectF &rect, MoveResizeMode mode) override;
     std::unique_ptr<WindowItem> createItem(Scene *scene) override;
 
-    // Signals for the scripting interface
-    // Signals make an excellent way for communication
-    // in between objects as compared to simple function
-    // calls
 Q_SIGNALS:
-    /**
-     * Emitted whenever the Client want to show it menu
-     */
-    void showRequest();
-    /**
-     * Emitted whenever the Client's menu is closed
-     */
-    void menuHidden();
-    /**
-     * Emitted whenever the Client's menu is available
-     */
-    void appMenuAvailable();
-    /**
-     * Emitted whenever the Client's menu is unavailable
-     */
-    void appMenuUnavailable();
-
     /**
      * Emitted whenever the Client's block compositing state changes.
      */
     void blockingCompositingChanged(KWin::X11Window *client);
-    void clientSideDecoratedChanged();
 
 private:
     void exportMappingState(int s); // ICCCM 4.1.3.1, 4.1.4, NETWM 2.5.1