⚡ 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/editor/previewEditor.ts

@@ -271,6 +271,7 @@ class Preview {
     this.diff = new PreviewDiff(
       () => this.from === undefined ? undefined : owner.diffBases.diffBase(document.uri, this.from),
       source => this.readOld(source),
+      () => this.oldInputs(),
       diff => this.post({ type: 'diff', diff }),
       text => logger.add({ level: 'warn', source: 'codeReader', message: `${document.uri.fsPath}：${text}` }),
     )
@@ -452,6 +453,11 @@ class Preview {
     return message.error === undefined ? { blocks: message.blocks, attributes: message.attributes } : undefined
   }
 
+  /** 排旧版本除了旧内容还看的（见 readOld）：选的翻译插件、项目入口、规则查到的定义和调用的种类变过几次。变了旧版本要重新解析 */
+  private oldInputs(): string {
+    return JSON.stringify([this.registry.selectedTranslator(this.document.languageId)?.id, this.owner.entries.namesOf(this.document.uri), this.lookups.revision, this.callees.revision])
+  }
+
   /** 这份文档里 offset 处名字的定义是哪种块：语言扩展查到的几处定义里第一处认得出的；语言扩展没答是 undefined。 */
   private async calleeKind(offset: number): Promise<BlockKind | null | undefined> {
     const { document } = this