Fix _paintAvatar in chip.dart to dispose layer. (#135228)

Author: polina-c

packages/flutter/lib/src/material/chip.dart

@@ -2065,21 +2065,26 @@ class _RenderChip extends RenderBox with SlottedContainerRenderObjectMixin<_Chip
     }
   }
 
+  final LayerHandle<OpacityLayer> _childOpacityLayerHandler = LayerHandle<OpacityLayer>();
+
   void _paintChild(PaintingContext context, Offset offset, RenderBox? child, bool? isEnabled) {
     if (child == null) {
+      _childOpacityLayerHandler.layer = null;
       return;
     }
     final int disabledColorAlpha = _disabledColor.alpha;
     if (!enableAnimation.isCompleted) {
       if (needsCompositing) {
-        context.pushLayer(
-          OpacityLayer(alpha: disabledColorAlpha),
+        _childOpacityLayerHandler.layer = context.pushOpacity(
+          offset,
+          disabledColorAlpha,
           (PaintingContext context, Offset offset) {
             context.paintChild(child, _boxParentData(child).offset + offset);
           },
-          offset,
+          oldLayer: _childOpacityLayerHandler.layer,
         );
       } else {
+        _childOpacityLayerHandler.layer = null;
         final Rect childRect = _boxRect(child).shift(offset);
         context.canvas.saveLayer(childRect.inflate(20.0), Paint()..color = _disabledColor);
         context.paintChild(child, _boxParentData(child).offset + offset);
@@ -2092,6 +2097,7 @@ class _RenderChip extends RenderBox with SlottedContainerRenderObjectMixin<_Chip
 
   @override
   void dispose() {
+    _childOpacityLayerHandler.layer = null;
     _avatarOpacityLayerHandler.layer = null;
     super.dispose();
   }