Fully qualify C# default values in exported fields.

This avoids issues when the default values rely on using
namespaces.

modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators.Sample/ExportedFields.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using System.Diagnostics.CodeAnalysis;
 
 #pragma warning disable CS0169
@@ -83,6 +84,10 @@ namespace Godot.SourceGenerators.Sample
         [Export] private StringName[] field_StringNameArray = { "foo", "bar" };
         [Export] private NodePath[] field_NodePathArray = { "foo", "bar" };
         [Export] private RID[] field_RIDArray = { default, default, default };
+        // Note we use Array and not System.Array. This tests the generated namespace qualification.
+        [Export] private Int32[] field_empty_Int32Array = Array.Empty<Int32>();
+        // Note we use List and not System.Collections.Generic.
+        [Export] private int[] field_array_from_list = new List<int>(Array.Empty<int>()).ToArray();
 
         // Variant
         [Export] private Variant field_Variant = "foo";

modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators.Sample/MoreExportedFields.cs

@@ -0,0 +1,19 @@
+using System;
+using System.Diagnostics.CodeAnalysis;
+
+#pragma warning disable CS0169
+#pragma warning disable CS0414
+
+namespace Godot.SourceGenerators.Sample
+{
+    [SuppressMessage("ReSharper", "BuiltInTypeReferenceStyle")]
+    [SuppressMessage("ReSharper", "RedundantNameQualifier")]
+    [SuppressMessage("ReSharper", "ArrangeObjectCreationWhenTypeEvident")]
+    [SuppressMessage("ReSharper", "InconsistentNaming")]
+    // We split the definition of ExportedFields to verify properties work across multiple files.
+    public partial class ExportedFields : Godot.Object
+    {
+        // Note we use Array and not System.Array. This tests the generated namespace qualification.
+        [Export] private Int64[] field_empty_Int64Array = Array.Empty<Int64>();
+    }
+}

modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/ExtensionMethods.cs

@@ -2,6 +2,7 @@ using System;
 using System.Collections.Generic;
 using System.Collections.Immutable;
 using System.Linq;
+using System.Text;
 using Microsoft.CodeAnalysis;
 using Microsoft.CodeAnalysis.CSharp;
 using Microsoft.CodeAnalysis.CSharp.Syntax;
@@ -165,6 +166,50 @@ namespace Godot.SourceGenerators
         public static string FullQualifiedName(this INamespaceSymbol namespaceSymbol)
             => namespaceSymbol.ToDisplayString(FullyQualifiedFormatOmitGlobal);
 
+        public static string FullQualifiedName(this ISymbol symbol)
+            => symbol.ToDisplayString(FullyQualifiedFormatOmitGlobal);
+
+        public static string FullQualifiedSyntax(this SyntaxNode node, SemanticModel sm)
+        {
+            StringBuilder sb = new();
+            FullQualifiedSyntax_(node, sm, sb, true);
+            return sb.ToString();
+        }
+
+        private static void FullQualifiedSyntax_(SyntaxNode node, SemanticModel sm, StringBuilder sb, bool isFirstNode)
+        {
+            if (node is NameSyntax ns && isFirstNode)
+            {
+                SymbolInfo nameInfo = sm.GetSymbolInfo(ns);
+                sb.Append(nameInfo.Symbol?.FullQualifiedName() ?? ns.ToString());
+                return;
+            }
+
+            bool innerIsFirstNode = true;
+            foreach (var child in node.ChildNodesAndTokens())
+            {
+                if (child.HasLeadingTrivia)
+                {
+                    sb.Append(child.GetLeadingTrivia());
+                }
+
+                if (child.IsNode)
+                {
+                    FullQualifiedSyntax_(child.AsNode()!, sm, sb, isFirstNode: innerIsFirstNode);
+                    innerIsFirstNode = false;
+                }
+                else
+                {
+                    sb.Append(child);
+                }
+
+                if (child.HasTrailingTrivia)
+                {
+                    sb.Append(child.GetTrailingTrivia());
+                }
+            }
+        }
+
         public static string SanitizeQualifiedNameForUniqueHint(this string qualifiedName)
             => qualifiedName
                 // AddSource() doesn't support angle brackets

modules/mono/editor/Godot.NET.Sdk/Godot.SourceGenerators/ScriptPropertyDefValGenerator.cs

@@ -170,7 +170,13 @@ namespace Godot.SourceGenerators
                     .Select(s => s?.Initializer ?? null)
                     .FirstOrDefault();
 
-                string? value = initializer?.Value.ToString();
+                // Fully qualify the value to avoid issues with namespaces.
+                string? value = null;
+                if (initializer != null)
+                {
+                    var sm = context.Compilation.GetSemanticModel(initializer.SyntaxTree);
+                    value = initializer.Value.FullQualifiedSyntax(sm);
+                }
 
                 exportedMembers.Add(new ExportedPropertyMetadata(
                     property.Name, marshalType.Value, propertyType, value));
@@ -207,7 +213,13 @@ namespace Godot.SourceGenerators
                     .Select(s => s.Initializer)
                     .FirstOrDefault(i => i != null);
 
-                string? value = initializer?.Value.ToString();
+                // This needs to be fully qualified to avoid issues with namespaces.
+                string? value = null;
+                if (initializer != null)
+                {
+                    var sm = context.Compilation.GetSemanticModel(initializer.SyntaxTree);
+                    value = initializer.Value.FullQualifiedSyntax(sm);
+                }
 
                 exportedMembers.Add(new ExportedPropertyMetadata(
                     field.Name, marshalType.Value, fieldType, value));