[wp-trac] [WordPress Trac] #64166: Twenty Twenty: Update theme to add Gutenberg styles and support

[WordPress Trac]

#64166: Twenty Twenty: Update theme to add Gutenberg styles and support
------------------------------+-------------------------
 Reporter:  westonruter       |      Owner:  westonruter
     Type:  defect (bug)      |     Status:  assigned
 Priority:  normal            |  Milestone:  6.9
Component:  Bundled Theme     |    Version:  5.3
 Severity:  normal            |   Keywords:  needs-patch
  Focuses:  css, performance  |
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 I just discovered that the Twenty Twenty theme is lacking `wp-block-
 styles` support. This is surprising because both Twenty Nineteen
 ([https://core.trac.wordpress.org/browser/trunk/src/wp-
 content/themes/twentynineteen/functions.php?rev=44149#L98 ref]) and Twenty
 Twenty-One ([https://core.trac.wordpress.org/browser/trunk/src/wp-
 content/themes/twentytwentyone/functions.php?rev=49216#L121 ref]) both had
 support as part of their initial commits, but not for the
 [https://core.trac.wordpress.org/browser/trunk/src/wp-
 content/themes/twentytwenty/functions.php?rev=46271 initial commit] for
 Twenty Twenty.

 The previous core themes all added support in separate tickets:

 * #45038: Twenty Ten
 * #45039: Twenty Eleven
 * #45040: Twenty Twelve
 * #45041: Twenty Thirteen
 * #45042: Twenty Fourteen
 * #45043: Twenty Fifteen
 * #45044: Twenty Sixteen
 * #45045: Twenty Seventeen

 The missing `wp-block-styles` theme support didn't seem to have any effect
 on Twenty Twenty because on the frontend this only has mattered if
 `wp_should_load_separate_core_block_assets()` returns true in in which
 case separate stylesheets are registered for each block in
 `register_block_type_from_metadata()`.

 The `wp-block-library-theme` stylesheet also gets enqueued via
 `wp_common_block_scripts_and_styles()` when the theme supports `wp-block-
 styles` (and `wp_should_load_separate_core_block_assets()` returns false).

 With #64099 and #64150, the lack of `wp-block-styles` theme support means
 that a theme cannot benefit from a reduction of CSS by inlining block
 styles on demand and having them hoisted to `HEAD` via the template
 enhancement output buffer (#43258).

-- 
Ticket URL: <https://core.trac.wordpress.org/ticket/64166>
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