Cubic: spacing missing between gallery blocks

[mikachan]

Steps to replicate

Since WordPress/gutenberg#38164 has merged, there will now be no default margin set between gallery blocks. This will affect themes that were relying on the margin on the gallery images to provide a gap between galleries, rather than actually setting a top margin to separate the blocks. As GB has switched from using margin to gap to separate the images in a gallery this removes this default separation.

Cubic is impacted by this:

Before	After

We could apply a CSS patch to fix this, for example:

figure.wp-block-gallery.has-nested-images {
    margin-top: 16px;
}

User report: p1649072900167279-slack-C029FM1EH

[madhusudhand]

Parent theme boardwalk also impacted.

[pbking]

I see the potential fix can be found here: D78763-code

Looks like a situation isn't covered by that fix (yet) though. (.wp-block-gallery:not(.has-nested-images) and needs another look-see. Moving back to in-progress for some more tweaking.

[madhusudhand]

Changes deployed and verified.