ui: Show call graphs, inheritance trees and include trees for active symbol (issue 249 337)

* Added TrailLayouter with Sugiyama dependency layouting
* Layouter supports horizontal and vertical layouts
* Added basic ui to graph view for showing incoming and outgoing paths
* Added depth slider, with infinity at maximum
* Disable trail ui when not available
* Added trail messages to undo stack and only use last one when undoing
* Added QtGraphLineBezier for trail graphs and refactored other line types
* Disabled edge activation for trail layouts, shown only visually
* Highlight all connected edges when hovering a node in trail layout
* Use different color when highlighting call edges for better contrast
* Fixed BucketLayouter issue when edge does not leave node
* Increased click area for angled edges

bug id = 249 337

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

@@ -6,6 +6,7 @@
 #include <QGraphicsItem>
 
 #include "utility/math/Vector2.h"
+#include "utility/math/Vector4.h"
 
 #include "data/graph/token_component/TokenComponentAggregation.h"
 
@@ -47,6 +48,9 @@ public:
 
 	void setDirection(TokenComponentAggregation::Direction direction);
 
+	bool isTrailEdge() const;
+	void setIsTrailEdge(std::vector<Vec4i> path, bool horizontal);
+
 protected:
 	virtual void mousePressEvent(QGraphicsSceneMouseEvent* event);
 	virtual void mouseMoveEvent(QGraphicsSceneMouseEvent* event);
@@ -55,6 +59,9 @@ protected:
 	virtual void hoverEnterEvent(QGraphicsSceneHoverEvent* event);
 	virtual void hoverLeaveEvent(QGraphicsSceneHoverEvent* event);
 
+private slots:
+	void dispatchMessageFocusIn();
+
 private:
 	const Edge* m_data;
 
@@ -66,12 +73,21 @@ private:
 	bool m_isActive;
 	bool m_fromActive;
 	bool m_toActive;
+
+	bool m_isFocused;
+
 	size_t m_weight;
 
 	TokenComponentAggregation::Direction m_direction;
 
+	bool m_isTrailEdge;
+	bool m_isHorizontalTrail;
+	std::vector<Vec4i> m_path;
+
 	Vec2i m_mousePos;
 	bool m_mouseMoved;
+
+	bool m_willDispatchMessageFocusIn;
 };
 
 #endif // QT_GRAPH_EDGE_H