The reference designator is stored separately with the Tracks, so we
need to extract position/size data from it there and match back to the
components later.
Fixes https://gitlab.com/kicad/code/kicad/issues/7733
std::map is not move-constructable on MSVC because
it is not declared noexcept (and is not required to be
by the standard)
This means that a struct containing graphic_element
cannot be inserted into a vector with move semantics without
compile errors. However, wrapping it in a unique_ptr
works.
Seth Hillbrand
Jon Evans