diff --git a/client.cpp b/client.cpp
index 169cccdf8c..f022086db6 100644
--- a/client.cpp
+++ b/client.cpp
@@ -419,6 +419,14 @@ void Client::repaintDecorationPending()
             ensureDecorationPixmapsPainted();
     }
 
+bool Client::decorationPixmapRequiresRepaint()
+    {
+    if (!paintRedirector)
+        return false;
+    QRegion r = paintRedirector->pendingRegion();
+    return !r.isEmpty();
+    }
+
 void Client::ensureDecorationPixmapsPainted()
     {
     if (!paintRedirector)
diff --git a/client.h b/client.h
index a725623548..773db2d58b 100644
--- a/client.h
+++ b/client.h
@@ -310,6 +310,7 @@ class Client
         const QPixmap *bottomDecoPixmap() const { return &decorationPixmapBottom; } 
         const QPixmap *rightDecoPixmap() const { return &decorationPixmapRight; } 
 
+        bool decorationPixmapRequiresRepaint();
         void ensureDecorationPixmapsPainted();
 
     private slots: