Sergey Biryukov 730d9d4b49 Editor: Add font size constraints for fluid typography.
This commit:
* Adds default minimum font size limits so that min font size, where provided, does not become smaller than `14px`/`0.875rem`/`0.875em`.
* For font sizes of `< 14px` that have no defined minimum sizes, uses the font size to set the floor of the `clamp()` value.

This bugfix prevents converting existing small font sizes to clamp values that will reduce their font size even further in narrow widths. It therefore improves backward compatibility and accessibility.

Original PR from Gutenberg repository:
* [https://github.com/WordPress/gutenberg/pull/44993 #44993 Fluid typography: add font size constraints]

Follow-up to [54260], [54360], [54497], [54500].

Props ramonopoly, andrewserong, isabel_brison, Joen, bernhard-reiter.
See #56467.
Built from https://develop.svn.wordpress.org/trunk@54646


git-svn-id: http://core.svn.wordpress.org/trunk@54198 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2022-10-19 12:27:10 +00:00
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