fix(terminal): avoid multiple terminals writing to same buffer (#37219)

Problem:  Calling termopen() or nvim_open_term() on a buffer with an
          existing terminal leads to two terminals writing to the same
          buffer if the terminal job is still running, or memory leak
          if the terminal job has exited.
Solution: Close the terminal if the terminal job has exited, otherwise
          report an error. For nvim_open_term() also don't write a
          closed terminal's buffer content to the PTY.

0 files changed, 0 insertions, 0 deletions