only skip GUI-updates when connected to frequently changing controllers

git-svn-id: https://lmms.svn.sf.net/svnroot/lmms/trunk/lmms@1449 0778d3d1-df1d-0410-868b-ea421aaaa00d

src/gui/widgets/knob.cpp

@@ -603,6 +603,8 @@ void knob::enterValue( void )
 void knob::friendlyUpdate( void )
 {
 	if( model()->getControllerConnection() == NULL ||
+		model()->getControllerConnection()->getController()->
+						frequentUpdates() == FALSE ||
 				controller::runningFrames() % (256*4) == 0 )
 	{
 		update();