Function addCoAuthorsButton

github-co-authors/github-co-authors.user.js:512–522

* Create and add the co-authors button. * @param {HTMLElement} root Element to search within and add the co-authors button to.

(root)

 * @param {HTMLElement} root Element to search within and add the co-authors button to.
 */
function addCoAuthorsButton(root) {
    const newMergeExperienceContainer = root.querySelector('react-partial[partial-name="mergebox-partial"]')
    const commitTitleInput = newMergeExperienceContainer?.querySelector('div:has(> label):nth-child(1)') ??
        root.querySelector('input[name="commit_title"]')
    if (!commitTitleInput || root.querySelector('[data-coauthors-button]')) {
        return
    }
    const button = createCoAuthorsUI(root, newMergeExperienceContainer)
    button.setAttribute('data-coauthors-button', '')
    commitTitleInput.insertAdjacentElement('afterend', button)
}

/**
 * Look for the PR merge form and add monitor it to add the co-authors button when possible.