CSS: backport the 6.1 Core kses regex changes to Gutenberg for safecss_filter_attr_allow_css #44961
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What?
Updates the
gutenberg_safecss_filter_attr_allow_css_6_1
filter added in #43004 with the latest Core changes committed in WordPress/wordpress-develop@cb6f447Props to @andrewserong for noticing that we hadn't backported the backport 🙇
Why?
So that Gutenberg's 6.1 compat matches the code that is in WordPress 6.1 Core.
How?
Copying over the new CSS filter regex from Core in order to allow min(), max(), minmax(), clamp() and var() values to be used in inline CSS.
Testing Instructions
The existing tests should pass, specifically those added in #43004