6.4.0 RC1

Features

• Add the option to select the style that is automatically applied.
• Add the option to resize Cover Block .
• Allow directly setting a solid background color on Cover block.
• Add list start, reversed settings.
• Add a help panel to the inserter available in all blocks.
• Typewriter experience.
• Add circle-crop variation to Image block.

Enhancements

• Add overflow support inside block switcher.
• Update GitHub action exit codes.
• Core Data: return updated record in saveEntityRecord.
• Latest Posts Block: (no title) instead of (Untitled) for a post without a title.
• Remove borders around inserter items for blocks with children blocks.
• Add disabled block count in the block manager.
• Writing Flow:
  • Add splitting in the quote block.
  • Allow undoing of patterns with BACKSPACE and ESC.

Experiments

• Widgets Screen:
  • Fix: Blocks are too close together.
  • Add Button block appender.

New APIs

• Add callbacks to ServerSideRenderer to handle failures with custom renderers.
• Add the block example API and use it for inserter and switcher previews.
• Enable an optional namespace parameter for hasAction & hasFilter .

Bug Fixes

• The duplicate button appears even if the block is not allowed.
• Double scrollbar appearing in full-screen mode.
• RichText: ignore selection changes during composition
• Missing default functions as props in BlockEditorProvider.
• Button block does not center on the editor.
• Guard block component against zombie state bug.
• Add truthy check for the Popover component onClose prop before calling it.
• Make InnerBlocks only force the template on directly set lockings.
• Check to ensure focus has intentionally left the wrapped component in withFocusOutside HOC.
• Correctly transform images with external sources into a gallery.
• Block toolbar appears above sidebar on medium viewports.
• Basecontrol name undefined triggring eslint-plugin TypeError.
• Image flickering & focus lose on resizing.
• Add get_item_schema function to WP_REST_Widget_Areas_Controller .
• Empty Classic Editor inside innerBlock fatal error.

Various

• Update re-resizable dependency
• Use mixins in button styles instead of media queries.
• Fix performance tests with the introduction of the navigation mode
• RichText code improvements: #16905, #16962.
• Scripts:
  • Improve the way test files are discovered.
  • Improve recommended settings included in the package.
  • Use the SCSS shared stylelint-config-wordpress config.
• Ignore the WordPress directory in stylelint.
• Fix: edit post sets some default block appender styles.
• Build: remove global install of latest npm.
• Project automation:
  • Rewrite actions using JavaScript.
  • Fix: Add first-time contributor label.
  • Fix: Add milestone.
• Remove unused CSS from ColorPalette component.

Documentation

• Add examples for the lockPostSaving and unlockPostSavingactions.
• Add guidance for adding/proposing/suggesting new components to the wordpress/components npm package.
• Add section about updating package after new releases.
• Add ESNext examples to format API tutorial.
• Document server-side functions that allow registering block styles.

Mobile

• Reset toolbar scroll on content change.
• Extract caption component.
• Not use ListEdit.
• Hide replaceable blocks when adding blocks.
• Make tapping at the end of post always insert at the end of the post.