Comment # 21 on bug 1114673 from Knut Alejandro Anderssen Gonz�lez

I have to check if it is a combination of changes that are not done correctly
(maybe just some order should be applied) by the API or if it is NM who prevent
from doing the changes. Thus, I will check if it is NM specific or also happens
with wicked.

The scenario seems to be:

Before do the zone changes:

Network backend: NetworkManager
Firewalld state: running
Default zone:    public
Interface:       ens4 (no explicit zone)

Changes applied through the UI:

Default zone: trusted
Interface:    ens4 (public zone)

As a first impression before a deep analysis and debugging it, seems that NM
does not apply the change in running because the interface was already in
public zone (not explicitly but because it was the default zone).