Measure Gizmo - Fixed unwanted volume displacement when click and dragging outside of an highlighted feature

src/slic3r/GUI/Gizmos/GLGizmoMeasure.cpp

@@ -310,6 +310,10 @@ bool GLGizmoMeasure::on_mouse(const wxMouseEvent &mouse_event)
 
             return true;
         }
+        else
+            // if the mouse pointer is on any volume, filter out the event to prevent the user to move it
+            // equivalent tp: return (m_parent.get_first_hover_volume_idx() != -1);
+            return m_curr_feature.has_value();
 
         // fix: prevent restart gizmo when reselect object
         // take responsibility for left up