fix: 修正规格返回后的颜色复核顺序 (#266)

client/src/pdd_u2_purchase_adapter.py

@@ -1303,6 +1303,11 @@ class U2PddPurchaseAdapter(PddPurchaseAdapter):
                     "observed_page_kind": current_page_kind,
                 },
             )
+        # 完整遍历第二规格后，面板可能停在尺码列表末端，颜色节点已经
+        # 滑出当前控件树。必须先回到颜色区域，再用最新控件树确认原颜色；
+        # 否则“当前看不见”会被误报成“颜色发生变化”。
+        current_xml = self._restore_purchase_panel_color_region(current_xml)
+        root = _parse_xml(current_xml)
         if not _selected(root, expected_snapshot.selected_color):
             raise PddPurchaseError(
                 "PURCHASE_SPEC_CONTEXT_CHANGED",
@@ -1311,7 +1316,6 @@ class U2PddPurchaseAdapter(PddPurchaseAdapter):
                 diagnostics={"context_check": "selected_color"},
             )
 
-        current_xml = self._restore_purchase_panel_color_region(current_xml)
         try:
             dimension = self._size_candidate_collector(self._require_device())
         except PddCollectError as exc: