The commit syncs the following changes from Gutenberg:
- Background images: add support for theme.json ref value resolution gutenberg#64128
- Background images: ensure appropriate default values gutenberg#64192
- Background image: ensure consistency with defaults and fix reset/remove functionality gutenberg#64328
These changes brings consistency to the default background image styles WordPress applies to user uploaded images, and adds support for ref resolution to "background" style properties.
Props andrewserong, aaronrobertshaw.
Fixes #61858
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Introduces the ability to specify a value for `background.backgroundAttachment` in theme.json styles.
The theme.json value determines the CSS value for the `background-attachment` property.
This feature was introduced into the Gutenberg plugin in version 18.9.
Props andrewserong, mukesh27, noisysocks, ramonopoly.
Fixes#61720
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`_wp_array_get()` is an expensive function, and it's called thousands of times on each page view on the front end. While the function performance was slightly improved in #58376, it is still called more times than it should be.
This commit aims to further optimize its usage:
* In many cases, `_wp_array_get()` can be replaced with a much simpler and faster `isset()` check.
* The `isset()` function is capable of checking nested arrays, so `isset( $foo['a']['b']['c'] )` will return false even if `$foo['a']` is unset, without throwing any errors or warnings.
* When `_wp_array_get()` cannot be directly replaced with `isset()`, it would be good practice to wrap it in an `isset()` function so that `_wp_array_get()` only runs when it needs to.
Original PR from Gutenberg repository:
* [https://github.com/WordPress/gutenberg/pull/51116#51116 Performance improvement: Reduce the use of the _wp_array_get() function]
Follow-up to [55851], [56382].
Props aristath, jrf, spacedmonkey, mukesh27, swissspidy, hellofromTonya.
Fixes#59405.
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ramonopoly
noisysocks
jorgefilipecosta
isabel_brison
Sergey Biryukov