[Bug] `<c-n>` and `<c-p>` do not trigger live preview

[midrare]

To reproduce:

1. Open :Themery
2. <c-n> or <c-p>
3. Observe that the selection has changed but the live preview does not update

[masroof-maindak]

Seconding this.

Thank you for the amazing plugin.

[CX330Blake]

+1.