[Fusion vNext] Add support for @skip / @include on fragments

src/HotChocolate/Fusion-vnext/src/Fusion.Execution/Planning/InlineFragmentOperationRewriter.cs

@@ -4,6 +4,7 @@
 
 namespace HotChocolate.Fusion.Planning;
 
+// TODO: We need to merge selections
 public sealed class InlineFragmentOperationRewriter(CompositeSchema schema)
 {
     public DocumentNode RewriteDocument(DocumentNode document, string? operationName)

src/HotChocolate/Fusion-vnext/src/Fusion.Execution/Planning/Nodes/InlineFragmentPlanNode.cs

@@ -8,14 +8,15 @@ public sealed class InlineFragmentPlanNode : SelectionPlanNode
     public InlineFragmentPlanNode(
         ICompositeNamedType declaringType,
         InlineFragmentNode inlineFragment)
-        : this(declaringType, inlineFragment.SelectionSet.Selections)
+        : this(declaringType, inlineFragment.Directives, inlineFragment.SelectionSet.Selections)
     {
     }
 
     public InlineFragmentPlanNode(
         ICompositeNamedType declaringType,
+        IReadOnlyList<DirectiveNode> directiveNodes,
         IReadOnlyList<ISelectionNode> selectionNodes)
-        : base(declaringType, [], selectionNodes)
+        : base(declaringType, directiveNodes, selectionNodes)
     {
     }
 

src/HotChocolate/Fusion-vnext/src/Fusion.Execution/Planning/OperationVariableBinder.cs

@@ -46,15 +46,15 @@ private static void CollectAndBindUsedVariables(
                         usedVariables.Add(variable.Name.Value);
                     }
                 }
+            }
 
-                foreach (var directive in field.Directives)
+            foreach (var directive in node.Directives)
+            {
+                foreach (var argument in directive.Arguments)
                 {
-                    foreach (var argument in directive.Arguments)
+                    if (argument.Value is VariableNode variable)
                     {
-                        if (argument.Value is VariableNode variable)
-                        {
-                            usedVariables.Add(variable.Name.Value);
-                        }
+                        usedVariables.Add(variable.Name.Value);
                     }
                 }
             }
@@ -67,7 +67,7 @@ private static void CollectAndBindUsedVariables(
 
         foreach (var variable in usedVariables)
         {
-            if(variableDefinitions.TryGetValue(variable, out var variableDefinition))
+            if (variableDefinitions.TryGetValue(variable, out var variableDefinition))
             {
                 operation.AddVariableDefinition(variableDefinition);
             }

src/HotChocolate/Fusion-vnext/test/Fusion.Execution.Tests/ConditionTests/SkipAndIncludeTests.cs

@@ -2,6 +2,7 @@
 
 namespace HotChocolate.Fusion;
 
+// TODO: Test shared skip selection with one selection having an include - should fail today incorrectly!
 public class SkipAndIncludeTests : FusionTestBase
 {
     [Test]