Schema: theme.json allows to set styles.blocks.*.spacing.blockGap

[ocean90]

Description

I was trying to set a default block gap styling via theme.json but that didn't work.

Example:

{
	"$schema": "https://schemas.wp.org/wp/5.9/theme.json",
	"version": 2,
	"styles": {
		"spacing": {
			"blockGap": "20px"
		},
		"blocks": {
			"core/navigation": {
				"spacing": {
					"blockGap": "8px"
				}
			}
		}
	}
}

Turns out that this isn't supported. Another related comment: #37360 (comment)

It would be nice if the schema could be adjusted to show an error if the blockGap property is set for block styles.

Step-by-step reproduction instructions

1. Extend the theme.json from Twenty-Twenty Two with the example from above
2. Notice that the block gap is not used, neither in the settings panel nor in the CSS output on frontend.

Screenshots, screen recording, code snippet

No response

Environment info

No response

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes

[mrleemon]

So, one cannot set a blockGap value in the styles section if blockGap is not enabled in the settings section? A theme developer would want to set a default blockGap but not let theme users change it.

[skorasaurus]

So, one cannot set a blockGap value in the styles section if blockGap is not enabled in the settings section? A theme developer would want to set a default blockGap but not let theme users change it.

UPDATE:

You can set a BlockGap value but prevent theme users from changing it by following this example:
but instead
set the blockGap value to false;

[skorasaurus]

Since this issue was made; blockGap on a per block basis was implemented In #40875

If you're having specific issue with the navigation block; please create a new issue.