Twenty Twenty-Two: Restore padding for Group blocks with a background color

[kjellr]

The patch that landed in #54944 removed left/right padding that was applied to all group blocks that had a background color. This removal was not necessary to fix the issue posed in the ticket.

Gutenberg provides a random default padding value for Group blocks with a background (​reference), and the CSS rule that was removed is meant to sync that up with the default site padding used in the theme.

Removing this value means that content inside of Group blocks (with backgrounds) no longer lines up with other site content. You can see this mismatch if you place two group blocks together, one with a background and one without. Before, the text used to line up on the same left vertical axis, but now it does not:

Before:

Current:

Restores the padding rule removed in ​https://github.com/WordPress/wordpress-develop/pull/2281.

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Site Editor

Before|After

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Post/Page Editor

Before|After

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Trac ticket: https://core.trac.wordpress.org/ticket/55103

[audrasjb]

Marking for commit.
This will partially revert [52679] (see #54944).
Then, please note that we'll need to backport both changesets at once to branch 5.9.

[audrasjb]

In 52686:

Twenty Twenty-Two: Restore custom padding for group blocks with a background color.

This change partially reverts [52679] which accidentally removed custom padding for group blocks with a background color.

Follow-up to [52679].

Props kjellr.
Fixes #55103.
See #54944.

Committed in https://core.trac.wordpress.org/changeset/52686

[audrasjb]

Reopening for backport.
Please note that this will be backported in one commit for both [52686] and [52679].

[audrasjb]

In 52688:

Twenty Twenty-Two: Remove negative side margins on group blocks with a background.

This change fixes an issue where applying a background color to a group block aligned it to the left in the editor.

Props eddystile, audrasjb, webmandesign, sabernhardt, petaryoast, kjellr.
Merges [52679] and [52686] to the 5.9 branch.
Fixes #54944, #55103.

[SergeyBiryukov]

In 52709:

Twenty Twenty-Two: Update mergeinfo after [52688].

See #54944, #55103.