Highliht diff in Jira issue history.
// ==UserScript==
// @name Jira history diff
// @version 2025-11-12
// @description Highliht diff in Jira issue history.
// @author vctls
// @match https://*.atlassian.net/*
// @icon https://www.google.com/s2/favicons?sz=64&domain=atlassian.net
// @grant none
// @require https://cdn.jsdelivr.net/gh/google/diff-match-patch@62f2e689f498f9c92dbc588c58750addec9b1654/javascript/diff_match_patch_uncompressed.js
// @license MIT
// @namespace https://greasyfork.org/users/299396
// ==/UserScript==
(function() {
'use strict';
const handleMessage = () => {
// Get all history entries that have description changes.
// TODO Find a more reliable selector.
const descChanges = document.querySelectorAll('[data-testid="issue-history.ui.history-items.generic-history-item.history-item"] >:nth-child(2):has(div:nth-child(1) > ._1reo1wug) ._1e0c1txw');
descChanges.forEach((element, index) => {
if (element.dataset.diffed) return;
const right = element.querySelector('._syazi7uo:nth-of-type(1) ._1reo1wug');
// nth-of-type(2) is the arrow icon between left and right items
const left = element.querySelector('._syazi7uo:nth-of-type(3) ._1reo1wug');
if (!left || !right) return;
element.style.display = "block";
const dmp = new diff_match_patch();
const diff = dmp.diff_main(right.innerText, left.innerText);
dmp.diff_cleanupSemantic(diff);
element.innerHTML = dmp.diff_prettyHtml(diff);
element.dataset.diffed = true;
});
};
let timeoutId;
const delayedHandler = () => {
clearTimeout(timeoutId);
timeoutId = setTimeout(() => handleMessage(), 10);
};
(new MutationObserver(delayedHandler)).observe(document, {childList: true, subtree: true});
})();