`--` ends pardes's options: `pardes -- -dash.txt` opens the file named -dash.txt

It said `no such option: --`. What follows `--` is a name, one at most,
as for any other positional.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

1 files changed, 9 insertions, 0 deletions

diff --git a/test/fs.py b/test/fs.py
index f24e2550..6c6bcbef 100644
--- a/test/fs.py
+++ b/test/fs.py
@@ -989,6 +989,7 @@ def test(binary, quic=False):
     for options, message in [
         (['--fs'], b'no such option'),
         (['--fs9'], b'no such option'),
+        (['--', 'a', 'b'], b'is the second'),
         (['--9p'], b'--9p needs a socket name'),
         (['--9p='], b'invalid 9P socket name'),
         (['--9p=a/b'], b'invalid 9P socket name'),
@@ -1396,6 +1397,14 @@ def test(binary, quic=False):
             assert time.monotonic() - deleted < .05, time.monotonic() - deleted
             assert second.wait(timeout=5) == 0
             assert edited.read_bytes() == b'edited\n'
+            # `--` ends the options: a name starting with a dash is a name.
+            dash = root / '-dash.txt'
+            dash.write_bytes(b'dash\n')
+            before = serials()
+            assert subprocess.run([binary, '--', dash.name], cwd=root, env=env, capture_output=True, timeout=10).returncode == 0
+            dashed, = serials() - before
+            assert client.read(f'/pane/{dashed}/name').rstrip(b'\n') == str(dash).encode()
+            client.remove(f'/pane/{dashed}')
             # --wait waits on the pane its look answered, on the look's own
             # open: a name /index shows escaped (a backslash is `\\` there)
             # is still the pane waited on, not one already gone.