AutomatableModelView/ContextMenu: option for unlinking all controls

Integrated patch by Rodrigo Rodrigues da Silva which adds an option
to all AutomatableModelView's context menu allowing to unlink all
linked controls.

src/core/AutomatableModel.cpp

@@ -418,6 +418,19 @@ void AutomatableModel::unlinkModels( AutomatableModel * _model1,
 
 
 
+void AutomatableModel::unlinkAllModels()
+{
+	foreach( AutomatableModel* model, m_linkedModels )
+	{
+		unlinkModels( this, model );
+	}
+
+	m_hasLinkedModels = false;
+}
+
+
+
+
 void AutomatableModel::setControllerConnection( ControllerConnection * _c )
 {
 	m_controllerConnection = _c;

src/gui/AutomatableModelView.cpp

@@ -68,6 +68,7 @@ void AutomatableModelView::addDefaultActions( QMenu * _menu )
 						_model->initValue<float>() ) ).
 				arg( m_unit ),
 					_model, SLOT( reset() ) );
+
 	_menu->addSeparator();
 	_menu->addAction( embed::getIconPixmap( "edit_copy" ),
 			AutomatableModel::tr( "&Copy value (%1%2)" ).
@@ -96,6 +97,14 @@ void AutomatableModelView::addDefaultActions( QMenu * _menu )
 
 	_menu->addSeparator();
 
+	if( _model->hasLinkedModels() )
+	{
+		_menu->addAction( embed::getIconPixmap( "edit-delete" ),
+							AutomatableModel::tr( "Remove all linked controls" ),
+							amvSlots, SLOT( unlinkAllModels() ) );
+		_menu->addSeparator();
+	}
+
 	QString controllerTxt;
 	if( _model->getControllerConnection() )
 	{
@@ -253,5 +262,10 @@ void AutomatableModelViewSlots::removeSongGlobalAutomation()
 }
 
 
+void AutomatableModelViewSlots::unlinkAllModels()
+{
+	amv->modelUntyped()->unlinkAllModels();
+}
+
 
 #include "moc_AutomatableModelView.cxx"