Add variable for admin-bar height

[nextgenthemes]

This adds a variable for the admin-bar height as seen in the 2021 theme but in core for all plugins and themes to utilize.

Trac ticket: https://core.trac.wordpress.org/ticket/52623#ticket

[ryelle]

Thanks for working on this!

I think you could also start to use that variable in this CSS - instead of setting the height twice. (I'm leaving another comment on the ticket about fallbacks)

[ryelle]

We've had some discussions on variable naming, and I think have landed on a pattern like --wp-admin--[location]--[property]. Using that format, this property should be:

Suggested change

	--wp-admin-bar-height: 32px;
	--wp-admin--admin-bar--height: 32px;

[hellofromtonya]

Closing as the ticket is closed and an alternative solution committed.