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Remove Caption Inline Width

Paste this code into your functions.php to remove the automatically generated inline style width for WordPress 3.4.

Code Snippet:

add_shortcode('wp_caption', 'fixed_img_caption_shortcode');
add_shortcode('caption', 'fixed_img_caption_shortcode');
function fixed_img_caption_shortcode($attr, $content = null) {
    // New-style shortcode with the caption inside the shortcode with the link and image tags.
    if ( ! isset( $attr['caption'] ) ) {
        if ( preg_match( '#((?:<a &#91;^>]+>s*)?<img &#91;^>]+>(?:s*</a>)?)(.*)#is', $content, $matches ) ) {
            $content = $matches[1];
            $attr['caption'] = trim( $matches[2] );
        }
    }

    // Allow plugins/themes to override the default caption template.
    $output = apply_filters('img_caption_shortcode', '', $attr, $content);
    if ( $output != '' )
        return $output;

    extract(shortcode_atts(array(
        'id'    => '',
        'align' => 'alignnone',
        'width' => '',
        'caption' => ''
    ), $attr));

    if ( 1 > (int) $width || empty($caption) )
        return $content;

    if ( $id ) $id = 'id="' . esc_attr($id) . '" ';

    return '<div ' . $id . 'class="wp-caption ' . esc_attr($align) . '" style="width: ' . $width . 'px">'
    . do_shortcode( $content ) . '<p class="wp-caption-text">' . $caption . '</p></div>';
}

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