18.9.0.1

• [***] Reader Comments: Updated comment threads with a new design and some new capabilities. [#17659]
• [**] Block editor: Fix issue where editor doesn't auto-scroll so you can see what is being typed. [wordpress-mobile/gutenberg-mobile#4299]
• [*] Block editor: Preformatted block: Fix an issue where the background color is not showing up for standard themes. [wordpress-mobile/gutenberg-mobile#4292]
• [**] Block editor: Update Gallery Block to default to the new format and auto-convert old galleries to the new format. [wordpress-mobile/gutenberg-mobile#4315]
• [***] Block editor: Highlight text: Enables color customization for specific text within a Paragraph block. [wordpress-mobile/gutenberg-mobile#4175]
• [**] Reader post details: a Comments snippet is now displayed after the post content. [#17650]