ui: Clear graph contents on overview (issue #609)

src/lib/component/controller/GraphController.cpp

@@ -36,10 +36,7 @@ void GraphController::handleMessage(MessageActivateAll* message)
 {
 	TRACE("graph all");
 
-	m_activeNodeIds.clear();
-	m_activeEdgeIds.clear();
-
-	m_dummyGraphNodes.clear();
+	clear();
 
 	if (message->acceptedNodeTypes != NodeTypeSet::all())
 	{

src/lib_gui/qt/view/QtGraphView.cpp

@@ -422,8 +422,9 @@ void QtGraphView::clear()
 		m_oldGraph.reset();
 
 		m_matchedNodes.clear();
-	});
 
+		getView()->scene()->clear();
+	});
 }
 
 void QtGraphView::focusTokenIds(const std::vector<Id>& focusedTokenIds)