Role improvement.

src/Squidex.Domain.Apps.Core.Model/Apps/Roles.cs

@@ -95,6 +95,11 @@ namespace Squidex.Domain.Apps.Core.Apps
                 throw new ArgumentException("Name already exists.", nameof(name));
             }
 
+            if (IsDefault(name))
+            {
+                return this;
+            }
+
             return new Roles(inner.With(name, newRole));
         }
 

tests/Squidex.Domain.Apps.Core.Tests/Model/Apps/RolesTests.cs

@@ -51,6 +51,14 @@ namespace Squidex.Domain.Apps.Core.Model.Apps
             Assert.Throws<ArgumentException>(() => roles_1.Add(role));
         }
 
+        [Fact]
+        public void Should_do_nothing_if_role_to_add_is_default()
+        {
+            var roles_1 = roles_0.Add(Role.Developer);
+
+            Assert.True(roles_1.CustomCount > 0);
+        }
+
         [Fact]
         public void Should_update_role()
         {