Revert "Make large diffs open quickly and scroll as one surface (#3212)"

This reverts commit b599d38a77.

packages/app/src/utils/diff-rendering.test.ts

@@ -1,7 +1,6 @@
 import { describe, expect, it } from "vitest";
 
 import {
-  compactHighlightTokens,
   formatDiffContentText,
   formatDiffGutterText,
   hasVisibleDiffTokens,
@@ -29,23 +28,4 @@ describe("diff-rendering", () => {
     expect(hasVisibleDiffTokens([{ text: "" }])).toBe(false);
     expect(hasVisibleDiffTokens([{ text: "const value = 1;" }])).toBe(true);
   });
-
-  it("compacts adjacent syntax tokens without changing their text or styles", () => {
-    expect(
-      compactHighlightTokens([
-        { text: "const", style: "keyword" },
-        { text: " ", style: null },
-        { text: "value", style: null },
-        { text: " ", style: null },
-        { text: "=", style: "operator" },
-        { text: "", style: "operator" },
-        { text: " 1", style: "number" },
-      ]),
-    ).toEqual([
-      { text: "const", style: "keyword" },
-      { text: " value ", style: null },
-      { text: "=", style: "operator" },
-      { text: " 1", style: "number" },
-    ]);
-  });
 });