⚡ perf(vscode): 代码阅读预览发给页面的块只记相对位置：块在源码里占的地方记成离前一块多远、自己多长，块里名字的下标从块的开头算，页面从文件开头累加回文件里的位置、和扩展端打交道的地方都在一处换算；靠前改了代码，后面内容没变的块发过去一模一样，扩展端自己的块和发给页面的块分成两种类型

vscode/webview-ui/src/codeReader/TextPreview.test.tsx

@@ -10,6 +10,7 @@ import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 import { DefinitionPeeks, linkPeekSource } from './definitionPeek'
 import { DiffText } from './DiffText'
 import { commentLinkOf } from './repoLink'
+import { NO_SPAN } from './testBlocks'
 import { MarkdownKindContext, TextPreview } from './TextPreview'
 
 let container: HTMLDivElement
@@ -134,7 +135,7 @@ describe.each(['TextPreview', 'DiffText'] as const)('%s 的 Markdown 页面元
     const peek: DefinitionPeek = {
       path: 'client.py',
       line: 1,
-      block: { id: '1', anchor: '1', kind: 'class', startLine: 1, endLine: 2, attributes: { kind: 'class' }, concepts: [], children: [], translation: [] },
+      block: { id: '1', anchor: '1', kind: 'class', span: NO_SPAN, attributes: { kind: 'class' }, concepts: [], children: [], translation: [] },
       names: [],
     }
     await act(async () => controller.answer(1, peek))