add textDirection in class stack

com.unity.uiwidgets/Runtime/rendering/stack.cs

         public RenderStack(
             StackFit? fit,
             Overflow? overflow,
+            TextDirection textDirection,
+            this.textDirection = textDirection;
             _alignment = alignment ?? Alignment.topLeft;
             _fit = fit ?? StackFit.loose;
             _overflow = overflow ?? Overflow.clip;
                 child.parentData = new StackParentData();
             }
         }
+        
+        Alignment _resolvedAlignment;
+        void _markNeedResolution() {
+            _resolvedAlignment = null;
+            markNeedsLayout();
+        }
+        
+        public TextDirection  textDirection {
+            get {
+                return _textDirection;
+            }
+            set {
+                if (_textDirection == value)
+                    return;
+                _textDirection = value;
+                _markNeedResolution();
+
+            }
+        }
+
+        TextDirection _textDirection;
+        
+        
+        
         Alignment _alignment;
 
         public Alignment alignment {
         public RenderIndexedStack(
             List<RenderBox> children = null,
             Alignment alignment = null,
+            TextDirection textDirection = default,
-        ) : base(fit: null, overflow: null, children: children, alignment: alignment ?? Alignment.topLeft) {
+        ) : base(fit: null, overflow: null, textDirection: textDirection, children: children, alignment: alignment ?? Alignment.topLeft) {
             _index = index;
         }
 

com.unity.uiwidgets/Runtime/widgets/basic.cs

         public override RenderObject createRenderObject(BuildContext context) {
             return new RenderStack(
                 alignment: alignment,
+                textDirection: Directionality.of(context),
                 fit: fit,
                 overflow: overflow
             );
             var renderObject = (RenderStack) renderObjectRaw;
             renderObject.alignment = alignment;
+            renderObject.textDirection = Directionality.of(context);
             renderObject.fit = fit;
             renderObject.overflow = overflow;
         }
             properties.add(new DiagnosticsProperty<Alignment>("alignment", alignment));
+            properties.add(new EnumProperty<TextDirection>("textDirection", textDirection, defaultValue: null));
             properties.add(new EnumProperty<StackFit>("fit", fit));
             properties.add(new EnumProperty<Overflow>("overflow", overflow));
         }