protected cookies appear to be deleted

[practik]

Steps to reproduce:

1. In the cookie manager window, protect some or all of the cookies from one domain.
2. Click the center trash icon ("Delete cookies from the selected domain").

Expected results: All unprotected cookies should disappear from the Cookies list, but the protected cookies should remain. (Ideally, there should be some visual indicator in the Cookies list that these cookies are protected – e.g. a lock icon, see also #10 here – so that users understand why they're still there.) Also, the corresponding cookie counter in the Domains list should update, though see #24.

Actual results: All of the domain's cookies disappear, and the domain disappears from the Domains list. The only way to see a correct list of domains and cookies is to refresh the page.

Cookie Quick Manager 0.2rc3 on Firefox 60.0.1 on macOS