[wp-trac] [WordPress Trac] #61858: Background images: resolve ref and ensure appropriate default values

[WordPress Trac]

#61858: Background images: resolve ref and ensure appropriate default values
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 Reporter:  ramonopoly   |      Owner:  (none)
     Type:  enhancement  |     Status:  new
 Priority:  normal       |  Milestone:  6.7
Component:  Themes       |    Version:
 Severity:  normal       |   Keywords:  has-patch has-unit-tests gutenberg-
  Focuses:               |  merge
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 Background image theme.json styling for blocks is slated for 6.7. See
 #61588

 This ticket tracks the following enhancements to background image block
 styles supports:

 == Add support for "ref" values in theme.son

 Theme.json values support "referencing" another value in theme.json using
 the "ref" keyword.

 These values are resolved by the WP_Theme_JSON class.

 "background" style properties do not yet support this feature.

 == Default values are not applied consistently

 Blocks with user-applied background images, i.e., background images added
 from a site's media library, receive certain default background size and
 position styles.

 These default styles increase the likelihood that an image sits well in a
 block without the user doing anything else.

 An enhancement here is to extend these defaults for uploaded images in
 block global styles.

 **Why set defaults only for uploaded images and not those defined in
 theme.json?**

 Setting defaults changes the way the background-image appears.

 Images added by the user in the editor receive defaults to increase the
 chances that they look "okay" in the editor immediately.

 We should respect, as much as possible, the values in theme.json, that
 includes values that are not set. The assumption is theme developers
 explicitly add and omit values. If the editor were to add default to
 theme.json styles, it would undermine that assumption.

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Ticket URL: <https://core.trac.wordpress.org/ticket/61858>
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