Added a hotkey repeat check to avoid bugs

// Create hotkeyConfig from opts

function createHotkeyConfig(defaultHotkeysConfig, hotkeysConfigOpts) {

    const result = {};

    const usedKeys = new Set();

    for (const key in defaultHotkeysConfig) {

        if (hotkeysConfigOpts[key] && isSingleLetter(hotkeysConfigOpts[key])) {

            // If the property passes the test, add 'Key' before it and save it

            result[key] = "Key" + hotkeysConfigOpts[key].toUpperCase();

        if (hotkeysConfigOpts[key] && isSingleLetter(hotkeysConfigOpts[key]) && !usedKeys.has(hotkeysConfigOpts[key].toUpperCase())) {

            // If the property passed the test and has not yet been used, add 'Key' before it and save it

            result[key] = 'Key' + hotkeysConfigOpts[key].toUpperCase();

            usedKeys.add(hotkeysConfigOpts[key].toUpperCase());

        } else {

            // Если свойство не прошло проверку, сохраняем значение по умолчанию

            console.error(

                `Hotkey: "${hotkeysConfigOpts[key]}" for ${key}, must contain only 1 letter. The default hotkey is set: ${defaultHotkeysConfig[key][3]}`

            );

            // If the property does not pass the test or has already been used, we keep the default value

            console.error(`Hotkey: ${hotkeysConfigOpts[key]} for ${key} is repeated and conflicts with another hotkey or is not 1 letter. The default hotkey is used: ${defaultHotkeysConfig[key]}`);

            result[key] = defaultHotkeysConfig[key];

        }

    }

    return result;

}