Statusline collapses to 1 line on terminal resize

Summary

Multi-line statusline output collapses to a single line when the terminal window is resized. The statusline does not re-render correctly after resize — only the first line is shown and the rest are removed.

Steps to Reproduce

1. Configure a multi-line statusline command in settings.json:

``json
"statusLine": {
"type": "command",
"command": "bash /path/to/statusline-command.sh"
}
``

1. The script outputs 2+ lines via printf '%b\n' to stdout
2. Initially renders correctly (all lines visible)
3. Resize the terminal window (drag to make narrower or wider)
4. Statusline collapses to only the first line — remaining lines are removed

Expected Behavior

After terminal resize, statusline should re-render all lines from the script output.

Actual Behavior

Only the first line persists after resize. Sending a new message does not fix it either.

Environment

• Claude Code v2.1.86
• macOS Darwin 25.3.0
• Terminal.app
• Model: Opus 4.6 (1M context)

Workaround

Limiting statusline output to 2 lines and keeping essential info on line 1.