Create login_wrapper view

Redirect the user if they are already logged in.

wagtail/wagtailadmin/views/account.py

@@ -2,6 +2,7 @@ from django.conf import settings
 from django.shortcuts import render, redirect
 from django.contrib import messages
 from django.contrib.auth.forms import SetPasswordForm
+from django.contrib.auth.views import login
 
 
 def account(request):
@@ -31,3 +32,11 @@ def change_password(request):
         'form': form,
         'can_change_password': can_change_password,
     })
+
+# Wrap login view to prevent logged in users accessing the page
+def login_wrapper(request, **kwargs):
+    if request.user.is_authenticated():
+        return redirect(settings.LOGIN_REDIRECT_URL)
+    else:
+        return login(request, **kwargs)
+