ui: Remove virtual nodes in depth graph edges when moving nodes (issue #639)

src/lib/component/controller/GraphController.cpp

@@ -516,6 +516,27 @@ void GraphController::handleMessage(MessageGraphNodeMove* message)
 	{
 		node->position += message->delta;
 
+		if (m_graph->getTrailMode() != Graph::TRAIL_NONE)
+		{
+			std::set<Id> childNodeIds;
+			for (const std::pair<Id, Id>& p : m_topLevelAncestorIds)
+			{
+				if (p.second == message->tokenId)
+				{
+					childNodeIds.insert(p.first);
+				}
+			}
+
+			for (std::shared_ptr<DummyEdge> edge : m_dummyEdges)
+			{
+				if (childNodeIds.find(edge->ownerId) != childNodeIds.end() ||
+					childNodeIds.find(edge->targetId) != childNodeIds.end())
+				{
+					edge->path.clear();
+				}
+			}
+		}
+
 		if (message->isReplayed())
 		{
 			buildGraph(message, GraphView::GraphParams());

src/lib_gui/qt/view/graphElements/QtGraphEdge.cpp

@@ -492,3 +492,8 @@ void QtGraphEdge::setUseBezier(bool useBezier)
 	m_useBezier = useBezier;
 	m_isHorizontal = true;
 }
+
+void QtGraphEdge::clearPath()
+{
+	m_path.clear();
+}

src/lib_gui/qt/view/graphElements/QtGraphEdge.h

@@ -58,6 +58,7 @@ public:
 	void setIsTrailEdge(std::vector<Vec4i> path, bool horizontal);
 
 	void setUseBezier(bool useBezier);
+	void clearPath();
 
 protected:
 	virtual void mousePressEvent(QGraphicsSceneMouseEvent* event);

src/lib_gui/qt/view/graphElements/QtGraphNode.cpp

@@ -506,6 +506,7 @@ void QtGraphNode::notifyEdgesAfterMove()
 	forEachEdge(
 		[](QtGraphEdge* edge)
 		{
+			edge->clearPath();
 			edge->updateLine();
 		}
 	);