Writes tests to ensure that property values are updated in docs that are of a composed type of the one that variants are being changed in.

src/Umbraco.Core/Models/ContentTypeBaseExtensions.cs

@@ -63,5 +63,20 @@ namespace Umbraco.Core.Models
             aliases = a;
             return hasAnyPropertyVariationChanged;
         }
+
+        /// <summary>
+        /// Returns the list of content types the composition is used in
+        /// </summary>
+        /// <param name="allContentTypes"></param>
+        /// <param name="source"></param>
+        /// <returns></returns>
+        internal static IEnumerable<IContentTypeComposition> GetWhereCompositionIsUsedInContentTypes(this IContentTypeComposition source,
+            IContentTypeComposition[] allContentTypes)
+        {
+            var sourceId = source != null ? source.Id : 0;
+
+            // find which content types are using this composition
+            return allContentTypes.Where(x => x.ContentTypeComposition.Any(y => y.Id == sourceId)).ToArray();
+        }
     }
 }

src/Umbraco.Core/Models/IContentTypeComposition.cs

@@ -10,6 +10,7 @@ namespace Umbraco.Core.Models
         /// <summary>
         /// Gets or sets the content types that compose this content type.
         /// </summary>
+        //fixme: we should be storing key references, not the object else we are caching way too much
         IEnumerable<IContentTypeComposition> ContentTypeComposition { get; set;  }
 
         /// <summary>