Inline highlight merges multiple small insertions into one block (semantic cleanup), no opt-out

[inchei]

Problem

When one line contains several small insertions, the inline highlight renders everything between the first and the last change as a single block instead of highlighting each change separately. This is especially visible for text without word boundaries (e.g. CJK text):

old: |原画= 作画：スタジオA、金田B、長崎C
new: |原画= 作画：スタジオA[アA]、金田B[カB]、長崎C[ナC]

Actual: one highlight span [アA]、金田B[カB]、長崎C[ナC].
Expected: three separate spans [アA], [カB], [ナC].

Root cause

diffChanges in packages/core/src/parse/change-range.ts calls fastDiff(delString, addString, 0, true). The hardcoded cleanup=true runs diff-match-patch semantic cleanup, which absorbs small equalities (like the 、 separators) into the surrounding edits.

Repro (node, @git-diff-view/file):

import { diffChanges } from "@git-diff-view/file";
const r = diffChanges({ text: newText } as any, { text: oldText } as any);
console.log(JSON.stringify(r.addRange.range));
// single INSERT "[アA]、金田B[カB]、長崎C[ナC]" instead of three INSERTs

Suggestion

Add an opt-out flag following the existing config convention in the same file (e.g. setEnableDiffSemanticCleanup, default true), and make the prebuilt fast-diff template survive rendering when setEnableFastDiffTemplate(true) is set (currently getPlainDiffTemplate/getSyntaxDiffTemplate always rebuild the single-span template, so the flag has no visible effect).

Happy to send a PR with the above.

[linear-code]

MRW-64