# tmux.PaneFilter.WindowIDIn

- **Module:** tmux.PaneFilter
- **Package:** github.com/libtmux/libtmux-go/tmux
- **Language:** Go
- **Kind:** attribute
- **Source:** https://github.com/libtmux/libtmux-go/blob/5f808882015a975a65acc7f9da5b3ff0d5cbdc91/tmux/filter_generated.go#L103
- **Page:** https://libtmux.org/reference/go/tmux-panefilter-windowidin/

WindowIDIn lists accepted values for the stable tmux window identifier from Pane.WindowID, including its @ sigil. A candidate matches when its materialized value equals one listed value. A nil slice leaves WindowIDIn unset; a non-nil empty slice is invalid.