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
Built from https://develop.svn.wordpress.org/trunk@58834
git-svn-id: http://core.svn.wordpress.org/trunk@58230 1a063a9b-81f0-0310-95a4-ce76da25c4cd
`_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.
Built from https://develop.svn.wordpress.org/trunk@56709
git-svn-id: http://core.svn.wordpress.org/trunk@56221 1a063a9b-81f0-0310-95a4-ce76da25c4cd
ramonopoly
noisysocks
jorgefilipecosta
isabel_brison
Sergey Biryukov