transport => auto - Image field outputs invalid background image value

[vladcosorg]

Issue description:

The generated rule is
background-image: http://link/to/image
but should be
background-image: url(http://link/to/image)

Version used:

2.3.2

Using theme_mods or options?

theme_mods

Code to reproduce the issue (config + field(s))

               'settings' => 'header_background_image',
               'label' => esc_html__('Background image', 'cf47rs'),
               'type' => 'image',
               'default' => '',
               'transport' => 'auto',
               'output' => [
                   [
                       'element' => '.header:not(.header--overlay)',
                       'property' => 'background-image'
                   ]
               ]

[Rayken]

I tend to use the prefix and suffix for background-image, see https://kirki.org/docs/arguments/output.html

Example:

'settings'  => 'header_background_image',
'label'     => esc_html__('Background image', 'cf47rs'),
'type'      => 'image',
'default'   => '',
'transport' => 'auto',
'output'    => array(
    array(
        'element'   => '.header:not(.header--overlay)',
        'property'  => 'background-image',
        'postfix'   => 'url(',
        'suffix'    => ')',
   ),
),
...

[aristath]

@chetzof hey there!
I believe this was just fixed, can you please check the develop branch?