fix mouse capture bug

engine/node.cpp

@@ -286,12 +286,19 @@ glm::vec4 Node::get_children_rect() const
 
 void Node::mouse_capture()
 {
+    // already owner of capture
+    if (root()->current_mouse_capture == this)
+        return;
+    
+    // cancel previous owner
     if (auto n = root()->current_mouse_capture)
     {
         MouseEvent e;
         e.m_type = kEventType::MouseCancel;
         n->handle_event(&e);
     }
+    
+    // make current
     root()->current_mouse_capture = this;
     m_mouse_captured = true;
 }

engine/node_canvas.cpp

@@ -284,4 +284,5 @@ void NodeCanvas::reset_camera()
     m_canvas->m_cam_rot = {0, 0};
     m_canvas->m_cam_pos = {0, 0, 0};
     m_canvas->m_cam_fov = 85;
+    m_canvas->m_pan = {0, 0};
 }