fix/#1923-470-introduced-a-slow-query-from-avatar-alt-text-Add-option-to-filter-avatar-alt

[ojopaul]

Description

4.7.0 introduced a slow query from avatar alt text, Add option to filter avatar alt fix

Benefits

We introduced the below code/filter to get_custom_avatar so user can return custom alt for avatar to prevent us running a function to get avatar alt text from the image url

        /**
         * Filters avatar alt.
         *
         * Passing a non-null value will prevent us fetching for avatar alt.
         *
         * @param string $avatar_alt text for the author's avatar. Default null.
         * @param Author $author The author's instance.
         * @param array $urls The avatar urls.
         * @param int $size The size of the avatar.
         *
         * @since 4.7.3
         *
         */
        $alt = apply_filters('multiple_authors_avatar_alt_text', null, $this, $urls, $size);
        if (is_null($alt)) {
            $imageId = attachment_url_to_postid($urls['url']);
            $alt = get_post_meta( $imageId, '_wp_attachment_image_alt', true );
        }

to fix #1923

Possible drawbacks

Applicable issues

#1923

Checklist

• I have created a specific branch for this pull request before committing, starting off the current HEAD of development branch.
• I'm submitting to the development, feature/hotfix/release branch. (Do not submit to the master branch!)
• This pull request relates to a specific problem (bug or improvement).
• I have mentioned the issue number in the pull request description text.
• All the issues mentioned in this pull request relate to the problem I'm trying to solve.
• The code I'm sending follows the PSR-12 coding style.