simple fix for yakuake's blur support

blur_support_e631915b2ff870317a9b674df66e2ebea374f151.patch

diff --git a/app/config/yakuake.kcfg b/app/config/yakuake.kcfg
index 1d19d21..392c632 100644
--- a/app/config/yakuake.kcfg
+++ b/app/config/yakuake.kcfg
@@ -85,6 +85,11 @@
     </entry>
   </group>
   <group name="Appearance">
+    <entry name="Blur" type="Bool">
+      <label context="@label">Blur</label>
+      <whatsthis context="@info:whatsthis">The KWin compositor's blur effects.</whatsthis>
+      <default>true</default>
+    </entry>
     <entry name="Skin" type="String">
       <label context="@label">Skin</label>
       <whatsthis context="@info:whatsthis">The skin to be used by the application window.</whatsthis>
diff --git a/app/mainwindow.cpp b/app/mainwindow.cpp
index 86192f7..f09c6a9 100644
--- a/app/mainwindow.cpp
+++ b/app/mainwindow.cpp
@@ -851,6 +851,7 @@ void MainWindow::applyWindowProperties()
         KWindowSystem::setState(winId(), NET::KeepAbove | NET::Sticky | NET::SkipTaskbar | NET::SkipPager);
 
     KWindowSystem::setOnAllDesktops(winId(), Settings::showOnAllDesktops());
+    KWindowEffects::enableBlurBehind(winId(), Settings::blur());
 }
 
 void MainWindow::applyWindowGeometry()