Reddit | Always expand comment box

Always expand comment box on reddit
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// ==UserScript==
// @name            Reddit | Always expand comment box
// @namespace       https://greasyfork.org/users/821661
// @match           https://www.reddit.com/*
// @match           https://sh.reddit.com/*
// @grant           none
// @noframes
// @version         1.0.0
// @author          hdyzen
// @description     Always expand comment box on reddit
// @license         GPL-3.0
// ==/UserScript==

const focusedElements = new WeakSet();
const init = () => {
    focusCommentBox();
    new MutationObserver(focusCommentBox).observe(document.body, {
        childList: true,
    });
};

window.addEventListener("load", init, { once: true });

function focusCommentBox() {
    const commentTextarea = document.querySelector("comment-body-header [noun='add_comment_button'] faceplate-textarea-input");
    if (!commentTextarea || focusedElements.has(commentTextarea)) return;
    focusedElements.add(commentTextarea);

    commentTextarea.dispatchEvent(
        new FocusEvent("focus", {
            bubbles: true,
            cancelable: true,
        }),
    );
    setTimeout(() => getDeepActiveElement()?.blur());
}

function getDeepActiveElement() {
    let activeElement = document.activeElement;
    while (activeElement?.shadowRoot) {
        activeElement = activeElement.shadowRoot.activeElement;
    }
    return activeElement;
}