Disabled domain_path_pathauto setting status not saved

Attached is the patch of the proposed solution. Instead of deleting the state of the domain_path_pathauto setting the setting is saved as FALSE so the checkbox is stays disabled when saving the node.

This patch checks if there's an existing alias for the domain id. If there's already one, "Generate automatic URL" will be disabled.

Sorry, just saw you published one patch anneke_vde, I'll give it a try.

@anneke_vde if I create a content, it generates an alias. If I edit again, the checkbox "Generate automatic URL alias" is checked, although it doesn't generate URLs with '-0' at the end. But if you change the title, the alias is updated.
In my case, I need the alias to stay the same, even if I change the title.

@guardiola86 the pathauto module has a setting for if you want the alias to be the same 'Do nothing. Leave the old alias intact.'.
I tested this but on my local dev it doesn't work. In the module code of domain path I see code for it: UPDATE_ACTION_NO_NEW.

Maybe better to create a new issue for that, this issue is about the setting not being saved.

I had the setting "'Do nothing. Leave the old alias intact.'" enabled, yet it was creating new aliases when changing the title.

#2 is working fine