# tmux.PaneFilter.WindowIndex

- **Module:** tmux.PaneFilter
- **Package:** github.com/libtmux/libtmux-go/tmux
- **Language:** Go
- **Kind:** attribute
- **Source:** https://github.com/libtmux/libtmux-go/blob/52968a3181c1c9e6d1b26c565d4b170968ae61c0/tmux/filter_generated.go#L109
- **Page:** https://libtmux.org/en/go/latest/reference/tmux-panefilter-windowindex/

WindowIndex exactly matches the nonnegative winlink index from Pane.WindowIndex. A nil pointer leaves WindowIndex unset; a non-nil pointer applies it, including when it points to the zero value.