"panic: runtime error" if tty is 1 line high

[sturob]

Checklist

• [X] I have read through the manual page (man fzf)
• [X] I have searched through the existing issues
• [X] For bug reports, I have checked if the bug is reproducible in the latest version of fzf

Output of fzf --version

0.53.0 (brew)

OS

• [ ] Linux
• [X] macOS
• [ ] Windows
• [ ] Etc.

Shell

• [X] bash
• [X] zsh
• [ ] fish

Problem / Steps to reproduce

1. Use tmux (or similar) to set the active TTY to 1 line high - tmux resize-pane -y 1
2. Run fzf
3. Result: fzf exits with "panic: runtime error: index out of range [1] with length 1"

See attachment for full error message: 20240621-fzf-macos-1-line-bug.txt

I believe this is a regression from 0.52.1 but I haven't downgraded to test that.

[junegunn]

Thanks for the report. Fixed on master.