Description of the Change

This change updates the plugin to handle post_mime_type argument when it has an array with a MIME type without the subtype i.e image instead of image/png.

Alternate Designs

Benefits

It's possible to search images when using the Gutenberg editor or Web Stories plugin.

Possible Drawbacks

Verification Process

1. Enable document indexing
2. Enable admin and AJAX via ep_admin_wp_query_integration and ep_ajax_wp_query_integration
3. Edit a post with the block editor
4. Add a new image block to bring up the media modal
5. Use the search bar to search for an image
6. See the image

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.

Applicable Issues

Closes: #1604 #2206

Changelog Entry

Fixed post_mime_type argument issue when it has an array with a MIME type without the subtype