ssh kitten: Fix "Connection closed" message being printed by ssh when running remote commands

Don't force allocate a tty when running remote commands. This
matches ssh behavior as well.

docs/changelog.rst

@@ -18,6 +18,9 @@ To update |kitty|, :doc:`follow the instructions <binary>`.
 
 - ssh kitten: Support system where the login shell is a non-POSIX shell
 
+- ssh kitten: Fix "Connection closed" message being printed by ssh when running
+  remote commands
+
 - Add support for the XTVERSION escape code
 
 - macOS: Fix a regression in 0.21.0 that broke middle-click to paste from clipboard (:iss:`3730`)

kittens/ssh/main.py

@@ -266,7 +266,9 @@ def main(args: List[str]) -> NoReturn:
         cmd += server_args
     else:
         hostname, remote_args = server_args[0], server_args[1:]
-        cmd += ['-t', hostname]
+        if not remote_args:
+            cmd.append('-t')
+        cmd.append(hostname)
         terminfo = subprocess.check_output(['infocmp', '-a']).decode('utf-8')
         f = get_posix_cmd if use_posix else get_python_cmd
         cmd += f(terminfo, remote_args)