Drop EffectsHandler::saturationSupported

Not used by any effect or anywhere in core.

libkwineffects/kwineffects.cpp

@@ -262,20 +262,6 @@ CompositingType EffectsHandler::compositingType() const
     return compositing_type;
 }
 
-bool EffectsHandler::saturationSupported() const
-{
-    switch(compositing_type) {
-#ifdef KWIN_HAVE_OPENGL_COMPOSITING
-    case OpenGLCompositing:
-        return GLTexture::saturationSupported();
-#endif
-    case XRenderCompositing:
-        return false; // never
-    default:
-        abort();
-    }
-}
-
 void EffectsHandler::sendReloadMessage(const QString& effectname)
 {
     QDBusMessage message = QDBusMessage::createMethodCall("org.kde.kwin", "/KWin", "org.kde.KWin", "reconfigureEffect");

libkwineffects/kwineffects.h

@@ -739,7 +739,6 @@ public:
 
     CompositingType compositingType() const;
     virtual unsigned long xrenderBufferPicture() = 0;
-    bool saturationSupported() const;
     virtual void reconfigure() = 0;
 
     /**