Redmine

hello,
i need to add this rule permission to allow watchers will can see and edit issues not assigned to them (so they will haven't 403 error to access).

I have no experience in Ruby, but I think that the change could be here:
https://github.com/redmine/redmine/blob/master/app/models/issue_query.rb

Could give you me a hand? I found a lot of related issues, but this is a problem without solution for the present.

Thanks a lot!