selection outline animated

src/node_canvas.h

@@ -16,6 +16,7 @@ public:
     Plane m_face_plane;
     LineSegment m_line;
     Plane m_grid;
+    glm::vec2 m_outline_pan;
     int m_grid_divs = 30;
     virtual Node* clone_instantiate() const override;
     virtual void init() override;
@@ -25,5 +26,6 @@ public:
     virtual void handle_resize(glm::vec2 old_size, glm::vec2 new_size) override;
     virtual kEventResult handle_event(Event* e) override;
     virtual void destroy_immediate() override;
+    virtual void on_tick(float dt) override;
     void reset_camera();
 };