chatgpt-disable-enter.js

// ==UserScript==
// @name         Suppresses unwanted sending with Enter key
// @namespace    http://tempus.org
// @version      0.3
// @description  Suppresses unwanted sending with Enter key on ChatGPT.
// @author       n-miyo
// @match        https://chat.openai.com
// @match        https://chat.openai.com/?model*
// @match        https://chat.openai.com/c/*
// @grant        none
// @downloadURL  https://gist.githubusercontent.com/n-miyo/da556a60c43e6301356fe9f2cd56f841/raw
// @updateURL    https://gist.githubusercontent.com/n-miyo/da556a60c43e6301356fe9f2cd56f841/raw
// ==/UserScript==

(function() {
    'use strict';
    const HOLD_MILLSEC = 100;
    const VERMILLON = 'rgb(253, 60, 47, 0.3)';

    function waitTextAreaPreparation() {
        let textArea = document.getElementById('prompt-textarea');
        if (textArea === null) {
            setTimeout(waitTextAreaPreparation, HOLD_MILLSEC);
            return;
        }
        let container = textArea.closest('div')
        if (container !== null) {
            container.style.borderColor=VERMILLON;
        }

        textArea.addEventListener('keydown', (e) => {
            if (e.code == "Enter" && !e.metaKey) {
                e.stopPropagation();
            }
        }, { capture: true });
    }
    waitTextAreaPreparation();
})();