fixed teco_doc_undo_exchange(): use reference counting now

* When popping from the Q-Register stack to local Q-Registers in macro calls,
  problems would arise when rubbing out that macro call since we would eventually restore
  a pointer that has been permanently freed along with the local Q-Registers.
* Naturally this could result in everything from Valgrind warnings to crashes.
* Added test case.
* There is still a test case that fails when run under `--valgrind`,
  but it's apparently due to a glib-internal memory leak.

0 files changed, 0 insertions, 0 deletions