⚡ perf(vscode): 标差异时旧版本的解析结果按旧内容记着，晚到的答案、翻译插件没变就不再重新解析

vscode/src/codeReader/deferredAnswers.ts

@@ -24,6 +24,8 @@ export class DeferredAnswers<Q, A> {
   /** 眼下这个版本查过（或正在查）的问题 */
   private readonly checked = new Set<string>()
   private timer: ReturnType<typeof setTimeout> | undefined
+  /** 查到的答案变过几次：按眼下的答案排出来的东西（对比用的旧版本）比这个数就知道还能不能接着用 */
+  private changes = 0
 
   constructor(
     private readonly idOf: (question: Q) => string,
@@ -34,6 +36,10 @@ export class DeferredAnswers<Q, A> {
     private readonly schedule: (run: () => void, ms: number) => ReturnType<typeof setTimeout> = setTimeout,
   ) {}
 
+  get revision(): number {
+    return this.changes
+  }
+
   session(): AnswerSession<Q, A> {
     const asked = new Map<string, Q>()
     return {
@@ -88,8 +94,10 @@ export class DeferredAnswers<Q, A> {
         return
       }
       const id = this.idOf(question)
-      if (!this.same(this.known.get(id), found))
+      if (!this.same(this.known.get(id), found)) {
         changed = true
+        this.changes++
+      }
       this.known.set(id, found)
     }))
     return { unanswered, changed }