The environment variable get the value of the preview label, even if it
has been updated with an action. It can be useful to track the label of
the preview and be able to switch between previews using only one
binding.
Co-authored-by: Junegunn Choi <junegunn.c@gmail.com>
- Renamed `track` action to `track-current` to highlight the difference between the global tracking state set by `--track` and a one-off tracking action
- `track` is still available as an alias
- Added `untrack-current` and `toggle-track-current` actions