Make Gallery size default configurable

[boblet]

Currently it’s not possible to set the default size in the Gallery Sizes pulldown when adding a gallery—it’s always thumbnail.

Size pulldown(http://oli.jp/temp/2016-01-29-wp4.4-gallery-size-setting.png)

For example, this code will set columns but not size

function my_gallery_defaults( $settings ) {
    $settings['galleryDefaults']['columns'] = 2;
    $settings['galleryDefaults']['size'] = 'medium';
    return $settings;
}

add_filter( 'media_view_settings', 'my_gallery_defaults' );

This has been mentioned in previous tickets:

• #18143 Adds Sizes pulldown to UI (but no $settings['galleryDefaults']['size'])
• #27515 Request for $settings['galleryDefaults']['size'] but marked as dupe of #18143
• #28693 Adds $settings['galleryDefaults'] support for columns and link
• #29032 Request for setting a custom default gallery size but marked as dupe of #18143

While this can be overridden via the UI, it would be nice to set the initial Gallery default size for a theme.

[boblet]

Gallery Settings Size pulldown

[boblet]

I just tested version 4.3.1, and see the same behavior there. HTH!

[Stagger Lee]

It works well. It inserts attribute inside shortcode, your image size from filter is used. Just this JS code responsible for select dropdown switch cannot work with this filter.
Image sizes miss "galleryDefaults" if I remember right.

[SergeyBiryukov]

#36810 was marked as a duplicate.

[programmin]

Same in 4.5.3

[chrisvanpatten]

#40692 was posted a few weeks back, and although it is a duplicate of this ticket it does have a working patch.

[cezariuszmarek]

I'm marking this as a duplicate of #40692, since the latter has a working patch.