hellofromTonya 26b2f466f4 Editor: Fix spacing property generation in flow layout type.
Fixes a bug of invalid CSS value when applying block spacing to a block as reported in [https://github.com/WordPress/gutenberg/issues/44435 Gutenberg issue 44435].

Adds logic to convert preset values (i.e. `$gap_value`) into valid CSS custom properties for the flow ('default') layout type. See the original fix in [https://github.com/WordPress/wordpress-develop/pull/3324 Gutenberg PR 3324].

Also adds a test dataset that fails before the bugfix and passes after the bugix.

Follow-up to [54274].

Props ndiego, isabel_brison, ramonopoly, andrewserong, hellofromTonya.
See #56467.
Built from https://develop.svn.wordpress.org/trunk@54311


git-svn-id: http://core.svn.wordpress.org/trunk@53870 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2022-09-26 14:58:12 +00:00
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