message: Make the `from` command `--xargs` feature work on Python 2.7.
diff: @@ -13,7 +13,6 @@ import termios
  import atexit
  import base64
  import tempfile
  -import subprocess
  from signal import signal, SIGPIPE, SIG_DFL
  import extratermclient
  @@ -76,7 +75,7 @@ def xargs(frame_names, command_list):
  for temp_file in temp_files:
  args.append(temp_file.name)
  - subprocess.run(args)
  + os.spawnvp(os.P_WAIT, args[0], [os.path.basename(args[0])] + args[1:])
  finally:
  # Clean up any temp files.
  