Provide a commerce condition to allow a promotion to be applied with a promo link only

The issue reported primarily manifests when the module is used together with a custom commerce condition that allows a promotion to be applied using a promotion link only (not applied by customer manually in the checkout). The temp store was used to check if the promotion was a applied by a link and as the temp store was lost on login the promotion was invalidated and removed. Therefore, I have changed this ticket from a bug report to a feature request.

There remains an issue that if the promo link is used and the user logs in before adding an item to their cart, the promotion will not be applied due to loss of the temp store on login (#3308135). However, this issue should be resolved with the aforementioned issue.

I have resolved this issue and created a new release (2.1.0).

Automatically closed - issue fixed for 2 weeks with no activity.