Twenty Sixteen: Update theme to add Gutenberg styles and support

[laurelfulford]

This ticket is to add Gutenberg styles and support for Twenty Sixteen, so it best takes advantage of the new editor.

For default themes, at the very least this would include adding styles for blocks to make sure they match the rest of the theme’s design, adding Gutenberg-specific editor styles for a better WYSIWYG experience, and adding theme support for the editor color palette.

Each default theme’s unique design should be considered for whether it makes sense to add support for wide alignments, and the best approach.

[laurelfulford]

I'll keep an eye on #45045 and incorporate anything decided there to the other themes, but since Beta 1 is coming up fast (October 19th), I figured it would be good to get the basic patches posted for the other themes.

45044.patch​ helps make sure the Gutenberg blocks match Twenty Sixteen's styles on the front-end, and adds styles for the editor.

I'm also attaching some screenshots of the editor before and after, since it's the most dramatic change, but if there's anything else specific anyone would like to see here, let me know!

[laurelfulford]

Classic Block showing the Markup post from the Theme Unit Test Data, before and after

[laurelfulford]

Common blocks, before and after.

[laurelfulford]

Alignments and dropcap, before and after

[laurelfulford]

45044.1.patch​ is based on the original patch, and fixes some minor issues, including making sure the styles are correct for RTL languages.

It also includes a editor colour palette based on Twenty Sixteen's different colour schemes (though simplified, since there's a lot of repetition of close shades within individual colour schemes, and across the whole set). I'll include a screenshot below.

This may be more confusing than not to include for Twenty Sixteen and Fifteen, which has a similar custom colour setup, so I'd be interested to know what people think.

[laurelfulford]

Editor colour palette

[davidakennedy]

Nice work @laurelfulford! A few small things that I noticed in testing:

• Front end verse block has border from pre; Editor styles do not.
• Recent posts grid view with bullets in editor, but not on the front end.
• Alignment in blockquote wp-block-quote.is-large has citation off in editor. Alignment is wrong.

Let me know if that doesn't make sense, and I can upload screenshots.

[laurelfulford]

Thanks @davidakennedy!

45044.2.patch​ Should take care of the above!

I also noticed the HTML Block styles changed in the editor in the latest version of Gutenberg, so I also removed some styles related to that in this patch.

[laurelfulford]

45044.3.patch​ is a really minor update that:

• Updates some of the CSS section headers, for consistency with the other themes, and fixes the order
• Swaps get_theme_file_uri() with get_template_directory_uri() for blocks.css, to make the enqueue format more consistent, and switches the versioning from numbers to date.

[davidakennedy]

@laurelfulford This looks good to commit for Beta. Marking it as so in case you can get to it before me today.

[davidakennedy]

In 43799:

Twenty Sixteen: Add styles and support for the new block-based editor.

This update adds styles and theme support related to the new block-based editor to enhance the experience of using it with Twenty Sixteen.

These are the specific changes made to this theme:

• Add blocks.css, to style blocks on the front end, to make sure they match the theme’s existing HTML element styles.
• Add editor-blocks.css to style blocks in the editor, to make sure they match the theme’s existing HTML element styles.
• Add theme support for editor-styles, to pull the existing editor stylesheet into the new editor.
• Add theme support for wp-block-styles, to load the default block styles on the front end.
• Add theme support for editor-color-palette, to load a color palette based on the theme’s color scheme into the block-based editor.

Props laurelfulford.
Fixes #45044.

[SergeyBiryukov]

Reopening for trunk.

[desrosj]

In 44147:

Twenty Sixteen: Add styles and support for the new block-based editor.

This update adds styles and theme support related to the new block-based editor to enhance the experience of using it with Twenty Sixteen.

These are the specific changes made to this theme:

• Add blocks.css, to style blocks on the front end, to make sure they match the theme’s existing HTML element styles.
• Add editor-blocks.css to style blocks in the editor, to make sure they match the theme’s existing HTML element styles.
• Add theme support for editor-styles, to pull the existing editor stylesheet into the new editor.
• Add theme support for wp-block-styles, to load the default block styles on the front end.
• Add theme support for editor-color-palette, to load a color palette based on the theme’s color scheme into the block-based editor.

Props laurelfulford, davidkennedy.

Merges [43799] to trunk.

Fixes #45044.