Jules Auto-Collapse Diffs

Automatically collapses diffs on Jules.google.com upon page load
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// ==UserScript==
// @name         Jules Auto-Collapse Diffs
// @namespace    http://tampermonkey.net/
// @version      1.2
// @description  Automatically collapses diffs on Jules.google.com upon page load
// @author       BCRTVKCS
// @license      MIT
// @match        https://jules.google.com/*
// @grant        none
// ==/UserScript==

(function() {
    'use strict';

    let lastUrl = location.href;
    let hasCollapsed = false;

    function attemptCollapse() {
        const btn = document.querySelector('button.collapse-all-button');

        // Button found and not yet collapsed on this page
        if (btn && !hasCollapsed) {
            hasCollapsed = true; // Lock immediately to prevent re-triggering

            // Wait 200 milliseconds for the framework to attach the event listener before clicking
            setTimeout(() => {
                const currentBtn = document.querySelector('button.collapse-all-button');
                if (currentBtn) {
                    currentBtn.click();
                    console.log("Jules Auto-Collapse: Diffs successfully collapsed.");
                }
            }, 200);
        }
    }

    // Reset state if URL changes in SPA (Single Page Application) architecture
    const observer = new MutationObserver(() => {
        if (location.href !== lastUrl) {
            lastUrl = location.href;
            hasCollapsed = false; // Navigated to a new file, allow collapsing again
        }
        attemptCollapse();
    });

    // Start observing DOM changes
    observer.observe(document.body, { childList: true, subtree: true });
})();