fixed duplicate permission

src/Squidex.Domain.Apps.Entities/Apps/RoleExtensions.cs

@@ -30,7 +30,7 @@ namespace Squidex.Domain.Apps.Entities.Apps
                 }
             }
 
-            permissions = result;
+            permissions = result.Distinct().ToArray();
 
             return permissions;
         }

tests/Squidex.Domain.Apps.Entities.Tests/Apps/RoleExtensionsRests.cs

@@ -23,6 +23,14 @@ namespace Squidex.Domain.Apps.Entities.Apps
             Assert.Equal(new[] { "squidex.apps.my-app.common" }, result);
         }
 
+        [Fact]
+        public void Should_not_have_duplicate_permission()
+        {
+            var source = new[] { "common", "common", "common" };
+            var result = source.Prefix("my-app");
+            Assert.Single(result);
+        }
+
         [Fact]
         public void Should_prefix_permission()
         {