Merging fixed.

src/Squidex.Domain.Apps.Core.Model/Contents/ContentData.cs

@@ -31,15 +31,15 @@ namespace Squidex.Domain.Apps.Core.Contents
         {
         }
 
-        protected static TResult Merge<TResult>(TResult target, TResult source1, TResult source2) where TResult : ContentData<T>
+        protected static TResult MergeTo<TResult>(TResult target, params TResult[] sources) where TResult : ContentData<T>
         {
-            if (ReferenceEquals(source1, source2))
+            Guard.NotEmpty(sources, nameof(sources));
+
+            if (sources.Length == 1 || sources.Skip(1).All(x => ReferenceEquals(x, sources[0])))
             {
-                return source1;
+                return sources[0];
             }
 
-            var sources = new[] { source1, source2 };
-
             foreach (var source in sources)
             {
                 foreach (var otherValue in source)

src/Squidex.Domain.Apps.Core.Model/Contents/IdContentData.cs

@@ -24,9 +24,14 @@ namespace Squidex.Domain.Apps.Core.Contents
         {
         }
 
+        public static IdContentData Merge(params IdContentData[] contents)
+        {
+            return MergeTo(new IdContentData(), contents);
+        }
+
         public IdContentData MergeInto(IdContentData target)
         {
-            return Merge(new IdContentData(), this, target);
+            return Merge(target, this);
         }
 
         public IdContentData ToCleaned()

src/Squidex.Domain.Apps.Core.Model/Contents/NamedContentData.cs

@@ -24,9 +24,14 @@ namespace Squidex.Domain.Apps.Core.Contents
         {
         }
 
+        public static NamedContentData Merge(params NamedContentData[] contents)
+        {
+            return MergeTo(new NamedContentData(), contents);
+        }
+
         public NamedContentData MergeInto(NamedContentData target)
         {
-            return Merge(new NamedContentData(), this, target);
+            return Merge(target, this);
         }
 
         public NamedContentData ToCleaned()

tests/Squidex.Domain.Apps.Core.Tests/Model/Contents/ContentDataTests.cs

@@ -86,12 +86,14 @@ namespace Squidex.Domain.Apps.Core.Model.Contents
                             .AddValue("iv", 1))
                     .AddField("field2",
                         new ContentFieldData()
-                            .AddValue("de", 2));
+                            .AddValue("de", 2)
+                            .AddValue("it", 2));
 
             var rhs =
                 new NamedContentData()
                     .AddField("field2",
                         new ContentFieldData()
+                            .AddValue("it", 3)
                             .AddValue("en", 3))
                     .AddField("field3",
                         new ContentFieldData()
@@ -104,6 +106,7 @@ namespace Squidex.Domain.Apps.Core.Model.Contents
                             .AddValue("iv", 1))
                     .AddField("field2",
                         new ContentFieldData()
+                            .AddValue("it", 2)
                             .AddValue("de", 2)
                             .AddValue("en", 3))
                     .AddField("field3",
@@ -127,12 +130,14 @@ namespace Squidex.Domain.Apps.Core.Model.Contents
                             .AddValue("iv", 1))
                     .AddField(2,
                         new ContentFieldData()
-                            .AddValue("de", 2));
+                            .AddValue("de", 2)
+                            .AddValue("it", 2));
 
             var rhs =
                 new IdContentData()
                     .AddField(2,
                         new ContentFieldData()
+                            .AddValue("it", 3)
                             .AddValue("en", 3))
                     .AddField(3,
                         new ContentFieldData()
@@ -145,6 +150,7 @@ namespace Squidex.Domain.Apps.Core.Model.Contents
                             .AddValue("iv", 1))
                     .AddField(2,
                         new ContentFieldData()
+                            .AddValue("it", 2)
                             .AddValue("de", 2)
                             .AddValue("en", 3))
                     .AddField(3,