⚡ perf(vscode): 代码阅读预览指纹变了的那几块里没变的部分仍沿用原来的对象：卡片重画，里面没变的文字不跟着重画

vscode/webview-ui/src/codeReader/sharing.test.ts

@@ -27,6 +27,16 @@ describe('新文档里指纹没变的块沿用上一份的对象', () => {
     expect(shared[1].children[1]).not.toBe(PREV[1].children[1])
   })
 
+  it('变了的块里没变的部分（译文、只是长短变了时的整张卡片内容）还是原来的对象：卡片重画，里面没变的文字不重画', () => {
+    const next = hashed([card('0', 'a'), { ...card('1', 'b', [card('1.0', 'c'), card('1.1', 'D')]), span: { ...NO_SPAN, length: 1 } }, card('2', 'e')])
+    const shared = shareBlocks(PREV, next)
+    expect(shared[1]).toEqual(next[1])
+    expect('translation' in shared[1] && shared[1].translation).toBe('translation' in PREV[1] && PREV[1].translation)
+    expect(shared[1].concepts).toBe(PREV[1].concepts)
+    const child = shared[1].children[1]
+    expect('translation' in child && child.translation[0]).not.toBe('translation' in PREV[1].children[1] && PREV[1].children[1].translation[0])
+  })
+
   it('多了、少了块：那一层是新的数组，没变的块照样沿用', () => {
     const longer = shareBlocks(PREV, hashed([card('0', 'a'), card('1', 'b', [card('1.0', 'c'), card('1.1', 'd')]), card('2', 'e'), card('3', 'f')]))
     expect(longer).not.toBe(PREV)

vscode/webview-ui/src/codeReader/sharing.ts

@@ -48,11 +48,21 @@ export function shareBlocks(prev: BlockView[] | undefined, next: BlockView[]): B
     }
   }
   collect(prev)
-  const share = (list: BlockView[], before: BlockView[] | undefined): BlockView[] => {
-    const shared = list.map(block => byHash.get(block.hash) ?? { ...block, children: share(block.children, byId.get(block.id)?.children) })
+  return share(next, prev)
+
+  function share(list: BlockView[], before: BlockView[] | undefined): BlockView[] {
+    const shared = list.map(block => byHash.get(block.hash) ?? changed(block))
     return before && before.length === shared.length && shared.every((block, index) => block === before[index]) ? before : shared
   }
-  return share(next, prev)
+
+  /** 变了的块（只有几块）里没变的部分和上一份的同一块逐个比着沿用：卡片重画，里面没变的文字不重画 */
+  function changed({ children, ...own }: BlockView): BlockView {
+    const old = byId.get(own.id)
+    if (!old)
+      return { ...own, children: share(children, undefined) }
+    const { children: before, ...was } = old
+    return { ...shareUnchanged(was, own), children: share(children, before) }
+  }
 }
 
 function isPlainObject(value: unknown): value is Record<string, unknown> {