A detached session no frontend has sized is 160x50, not 80x24

At 80x24 a script's third or fourth pane/new was refused for want of
rows. `size` still sets any other size, and a frontend attaching its own.

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

1 files changed, 5 insertions, 5 deletions

diff --git a/test/fs.py b/test/fs.py
index 45fdbc38..89801a71 100644
--- a/test/fs.py
+++ b/test/fs.py
@@ -596,12 +596,12 @@ def cut_writes(binary):
             client.write(f'/pane/{serial}/ctl', block)
             body = client.read(f'/pane/{serial}/body').decode().splitlines()
             assert body == ['line %05d of the block' % i for i in range(2500)], (len(body), body[:2])
-            # A detached session with no frontend is 80x24 until told.
+            # A detached session with no frontend is 160x50 until told.
             screen = client.screen()
-            assert (screen['cols'], screen['rows']) == (80, 24), (screen['cols'], screen['rows'])
-            client.write('/ctl', b'size 132 50\n')
+            assert (screen['cols'], screen['rows']) == (160, 50), (screen['cols'], screen['rows'])
+            client.write('/ctl', b'size 132 40\n')
             screen = client.screen()
-            assert (screen['cols'], screen['rows']) == (132, 50), (screen['cols'], screen['rows'])
+            assert (screen['cols'], screen['rows']) == (132, 40), (screen['cols'], screen['rows'])
 
 
 def test(binary, quic=False):
@@ -813,7 +813,7 @@ def test(binary, quic=False):
                     contents = restored.read(f'/pane/{file_id}/body')
                     assert contents == b'dumped state\n', (contents, saved.read_text(), restored.read('/index'))
                     assert restored.read(f'/pane/{control_id}/body') == b'', 'commands ran through exec, not the body'
-                    assert restored.screen()['cols'] == 80
+                    assert restored.screen()['cols'] == (80 if tty else 160)  # a detached one is 160x50
                     opened = look(restored, '/n/own/os' + str(root / (name + '.txt')), source=control_id)
                     assert restored.read(f'/pane/{opened}/body') == b'initial\n'