feat(language-server): merge HTML completions and hover into one response

packages/language-server/test/html-regions.test.ts

@@ -1,5 +1,10 @@
 import { expect, test } from "bun:test";
-import { isInsideHtml, viewRegions, virtualHtmlDocument } from "../src/html-regions.ts";
+import {
+  clearHtmlRegionCache,
+  isInsideHtml,
+  viewRegions,
+  virtualHtmlDocument,
+} from "../src/html-regions.ts";
 
 function doc(text: string): { uri: string; text: string; version?: number } {
   return { uri: `file:///${Math.random()}.wrn`, text };
@@ -99,6 +104,22 @@ test("regions are cached per document version", () => {
   expect(isInsideHtml(first, PAGE.indexOf("<div"))).toBe(false);
 });
 
+test("clearHtmlRegionCache drops a closed document's cached regions", () => {
+  // A reopened document commonly restarts at version 1. Without clearing the
+  // cache on close, that version would match the stale entry from the prior
+  // session and serve regions scanned from the old text.
+  const first = doc(PAGE);
+  first.version = 1;
+  expect(isInsideHtml(first, PAGE.indexOf("<div"))).toBe(true);
+
+  clearHtmlRegionCache(first.uri);
+
+  // Same uri, same version 1, but a document with no view block at all: if
+  // the cache had survived, this would still report true from the old scan.
+  const reopened = { uri: first.uri, text: "page A { }", version: 1 };
+  expect(isInsideHtml(reopened, PAGE.indexOf("<div"))).toBe(false);
+});
+
 test("isInsideHtml distinguishes markup from surrounding code", () => {
   const source = doc(PAGE);
   const markupOffset = PAGE.indexOf("<div");