Layout: backport fix to ensure blocks without layout support do not receive layout classnames #5900
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Backport changes from the Gutenberg plugin in: WordPress/gutenberg#56187
Prevent layout classnames from being output on blocks where there is no layout support and child layout classnames are not being output. An example is a paragraph that is a child of a group block, and that has
selfStretch
set tofit
. In this case, no layout classnames should be added to the paragraph block, but prior to WordPress/gutenberg#56187 they were being added unexpectedly.This PR also adds a test to cover the fix. For further context and sample test markup, see the PR description of WordPress/gutenberg#56187
Trac ticket: https://core.trac.wordpress.org/ticket/60292
This Pull Request is for code review only. Please keep all other discussion in the Trac ticket. Do not merge this Pull Request. See GitHub Pull Requests for Code Review in the Core Handbook for more details.