fix(tree-select): hoist Row to module scope to prevent row remounts

The row renderer was defined inside VirtualizedTree, giving it a new
component identity on every parent render — react-window then remounted
every row, destroying row DOM/state. Move Row to module scope and pass
flattened/tree/renderNode through react-window's rowProps instead of the
closure.

Verified at runtime: rows render, expand/collapse and select work, and
selection state survives re-renders, with no console errors.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

components/tree-select/VirtualizedTree.tsx

@@ -4,8 +4,8 @@ import {
   TreeNodeData,
   UseTreeReturnType,
 } from "@mantine/core"
-import React, { CSSProperties, useMemo } from "react"
-import { List } from "react-window"
+import React, { useMemo } from "react"
+import { List, RowComponentProps } from "react-window"
 import "./mantine-scrollbar.css"
 
 export interface VirtualizedTreeProps {
@@ -51,6 +51,78 @@ function flattenByExpanded(
   return res
 }
 
+/** 行渲染所需的闭包数据，通过 react-window 的 rowProps 传入 */
+interface RowData {
+  flattened: { node: TreeNodeData; level: number }[]
+  tree: UseTreeReturnType
+  renderNode: (payload: RenderTreeNodePayload) => React.ReactNode
+}
+
+/**
+ * 单行渲染组件 —— 提到模块作用域，避免每次父组件渲染都生成新的组件实例
+ * （否则 react-window 会在每次渲染时 remount 所有行，销毁行内状态）
+ */
+function Row({
+  index,
+  style,
+  flattened,
+  tree,
+  renderNode,
+}: RowComponentProps<RowData>) {
+  const { node, level } = flattened[index]
+
+  // 构造 Mantine 的 RenderTreeNodePayload
+  const nodeValue = String(node.value)
+  const hasChildren = Array.isArray(node.children) && node.children.length > 0
+  const expanded = !!(tree && (tree as any).expandedState?.[nodeValue])
+  const selected = !!(
+    tree && (tree as any).selectedState?.includes?.(nodeValue)
+  )
+  const hovered = tree ? (tree as any).hoveredNode === nodeValue : false
+
+  // elementProps: 与 Mantine Tree 内部的 props shape 对齐，外部的 renderNode 会 spread 这个对象
+  const elementProps = {
+    className: "",
+    style: {
+      display: "flex",
+      alignItems: "center",
+      width: "100%",
+    } as React.CSSProperties,
+    onClick: (e: React.MouseEvent) => {
+      // 保持与 Mantine Tree 一致的基础行为：选中、展开切换由 tree 控制
+      // 点击行为在业务端通常由 renderNode 决定（例如中间区域用于 toggleExpanded）
+      // 这里我们调用 tree.toggleExpanded 以保证基础交互一致（不会阻止外部覆盖）
+      if (tree && typeof tree.toggleExpanded === "function") {
+        tree.toggleExpanded(nodeValue)
+      }
+      false && console.log(e)
+    },
+    "data-selected": selected as boolean | undefined,
+    "data-value": nodeValue,
+    "data-hovered": hovered as boolean | undefined,
+  }
+
+  const payload: RenderTreeNodePayload = {
+    level,
+    expanded,
+    hasChildren,
+    selected,
+    node,
+    tree,
+    elementProps,
+  }
+
+  // paddingLeft 模拟 Mantine 的 levelOffset 行为（renderNode 可使用 elementProps.style 覆盖）
+  const paddedStyle: React.CSSProperties = {
+    ...style,
+    boxSizing: "border-box",
+    overflow: "hidden",
+  }
+
+  // 将 style 作为容器传入，Mantine 的 renderNode 也会接受 elementProps.style
+  return <div style={paddedStyle}>{renderNode(payload)}</div>
+}
+
 /**
  * VirtualizedTree - Mantine v8 compatible virtualized Tree
  *  - Accepts tree (useTree() result) and data: TreeNodeData[]
@@ -72,62 +144,6 @@ export function VirtualizedTree({
       flattenByExpanded(data, (tree && (tree as any).expandedState) || {}, 0),
     [data, tree]
   )
-  // react-window 的行渲染
-  /** 单行渲染组件 */
-  const Row = ({ index, style }: { index: number; style: CSSProperties }) => {
-    const { node, level } = flattened[index]
-
-    // 构造 Mantine 的 RenderTreeNodePayload
-    const nodeValue = String(node.value)
-    const hasChildren = Array.isArray(node.children) && node.children.length > 0
-    const expanded = !!(tree && (tree as any).expandedState?.[nodeValue])
-    const selected = !!(
-      tree && (tree as any).selectedState?.includes?.(nodeValue)
-    )
-    const hovered = tree ? (tree as any).hoveredNode === nodeValue : false
-
-    // elementProps: 与 Mantine Tree 内部的 props shape 对齐，外部的 renderNode 会 spread 这个对象
-    const elementProps = {
-      className: "",
-      style: {
-        display: "flex",
-        alignItems: "center",
-        width: "100%",
-      } as React.CSSProperties,
-      onClick: (e: React.MouseEvent) => {
-        // 保持与 Mantine Tree 一致的基础行为：选中、展开切换由 tree 控制
-        // 点击行为在业务端通常由 renderNode 决定（例如中间区域用于 toggleExpanded）
-        // 这里我们调用 tree.toggleExpanded 以保证基础交互一致（不会阻止外部覆盖）
-        if (tree && typeof tree.toggleExpanded === "function") {
-          tree.toggleExpanded(nodeValue)
-        }
-        false && console.log(e)
-      },
-      "data-selected": selected as boolean | undefined,
-      "data-value": nodeValue,
-      "data-hovered": hovered as boolean | undefined,
-    }
-
-    const payload: RenderTreeNodePayload = {
-      level,
-      expanded,
-      hasChildren,
-      selected,
-      node,
-      tree,
-      elementProps,
-    }
-
-    // paddingLeft 模拟 Mantine 的 levelOffset 行为（renderNode 可使用 elementProps.style 覆盖）
-    const paddedStyle: React.CSSProperties = {
-      ...style,
-      boxSizing: "border-box",
-      overflow: "hidden",
-    }
-
-    // 将 style 作为容器传入，Mantine 的 renderNode 也会接受 elementProps.style
-    return <div style={paddedStyle}>{renderNode(payload)}</div>
-  }
 
   return (
     <List
@@ -135,8 +151,8 @@ export function VirtualizedTree({
       style={{ height, width: "100%" }}
       className="custom-scrollbar"
       rowHeight={itemSize}
-      rowComponent={({ index, style }) => <Row index={index} style={style} />}
-      rowProps={{}}
+      rowComponent={Row}
+      rowProps={{ flattened, tree, renderNode }}
       overscanCount={overscanCount}></List>
   )
 }