Add AssignmentStatementWidget.

Author: ChebanovDD

src/UnityUxmlGenerator.UnityPackage/Assets/Plugins/UnityUxmlGenerator/Runtime/UnityUxmlGenerator.dll

@@ -48,9 +48,9 @@ private static MemberDeclarationSyntax[] GetUxmlAttributeMembers()
                     identifier: "defaultValue",
                     type: NullableType(PredefinedType(Token(SyntaxKind.ObjectKeyword))),
                     addDefaultKeyword: true),
-                bodyStatements: ExpressionStatement(AssignmentWidget(
+                bodyStatements: AssignmentStatementWidget(
                     left: IdentifierName("DefaultValue"),
-                    right: IdentifierName("defaultValue"))),
+                    right: IdentifierName("defaultValue")),
                 addGeneratedCodeAttributes: true
             ),
             PropertyWidget(

src/UnityUxmlGenerator/UxmlGenerator.Attributes.cs

@@ -236,15 +236,15 @@ private static IEnumerable<StatementSyntax> GetAttributeValueAssignments(Generat
             var propertyName = property.GetName();
             var fieldName = propertyName.ToPrivateFieldName();
 
-            attributeValueAssignments.Add(ExpressionStatement(GetAttributeValueAssignment(propertyName, fieldName)));
+            attributeValueAssignments.Add(GetAttributeValueAssignmentStatement(propertyName, fieldName));
         }
 
         return attributeValueAssignments;
     }
 
-    private static ExpressionSyntax GetAttributeValueAssignment(string propertyName, string fieldName)
+    private static StatementSyntax GetAttributeValueAssignmentStatement(string propertyName, string fieldName)
     {
-        return AssignmentWidget(
+        return AssignmentStatementWidget(
             left: MemberAccessWidget(identifier: "control", memberName: propertyName),
             right: MethodAccessWidget(
                 identifier: fieldName,

src/UnityUxmlGenerator/UxmlGenerator.Traits.cs

@@ -238,6 +238,14 @@ private static EqualsValueClauseSyntax CastExpressionWidget(
         return EqualsValueClause(CastExpression(typeToCast, IdentifierName(identifier)));
     }
 
+    private static StatementSyntax AssignmentStatementWidget(
+        ExpressionSyntax left,
+        ExpressionSyntax right,
+        SyntaxKind expression = SyntaxKind.SimpleAssignmentExpression)
+    {
+        return ExpressionStatement(AssignmentWidget(left, right, expression));
+    }
+
     private static ExpressionSyntax AssignmentWidget(
         ExpressionSyntax left,
         ExpressionSyntax right,