User input unified and fixed for clone source

Fixed slider in player, show filtered image when disabled (outside mixing circle), correct timing for clone source (different for filters).

StreamSource.cpp

@@ -154,13 +154,6 @@ void StreamSource::setActive (bool on)
         if (active_ != was_active)
             stream_->enable(active_);
 
-        // change visibility of active surface (show preview of stream when inactive)
-        if (activesurface_) {
-            if (active_)
-                activesurface_->setTextureIndex(Resource::getTextureTransparent());
-            else
-                activesurface_->setTextureIndex(stream_->texture());
-        }
     }
 }