Only load wp-editor-classic-layout-styles styles for themes without theme.json support #1290
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Part of https://core.trac.wordpress.org/ticket/53175
See WordPress/gutenberg#31322
Related WordPress/gutenberg#30375
How to test
Activate a theme without
theme.json
support (TwentyTwenty):wp-editor-classic-layout-styles-css
external stylesheet is loaded.Activate a theme with
theme.json
support (TT1-blocks from the github repo not from the WordPress theme's repo, or add a theme.json file to the TwentyTwentyOne theme):wp-editor-classic-layout-styles-css
external stylesheet is not loaded.