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Prevent too many redirects error when home page URL set to external_urll

Many users naively set the home page URL setting to external_url (e.g. https://mydomain.com). When an unauthenticated user signs in, this causes endless redirections. For example, this is occuring:

  1. Unauthenticated user attempts to access https://mydomain.com/dashboard
  2. Application redirects to the home page URL: https://mydomain.com
  3. Repeat step 2

In step 3, ApplicationController should have redirected the user to https://mydomain.com/users/sign_in. Disabling the redirection if home page URL is the same as external_url prevents users from messing up.

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