save camera settings on selection to avoid different result when re-projecting the selection 2d screen points transformation (does not compile because of canvas.h cyclic dependency)

src/canvas_modes.h

@@ -3,11 +3,12 @@
 #include "shape.h"
 #include "brush.h"
 #include "texture.h"
+#include "canvas.h"
 #include <poly2tri.h>
 
-NS_START
-class Canvas;
-NS_END
+// NS_START
+// class Canvas;
+// NS_END
 
 class CanvasMode
 {
@@ -122,6 +123,7 @@ class CanvasModeMaskFree : public CanvasMode
     bool m_dragging = false;
     std::vector<vertex_t> m_points;
     std::vector<glm::vec2> m_points2d;
+    struct ui::CameraData m_selection_cam;
 public:
     virtual void on_Draw(const glm::mat4& ortho, const glm::mat4& proj, const glm::mat4& camera) override;
     virtual void on_MouseEvent(MouseEvent* me, glm::vec2& loc) override;