This changeset adds Unicode sequence normalization from NFD to NFC, via the `normalizer_normalize()` PHP function which is available with the recommended `intl` PHP extension.
This fixes an issue where NFD characters were not properly sanitized. It also provides a unit test for NFD sequences (alternate Unicode representations of the same characters).
Props NumidWasNotAvailable, targz, nacin, nunomorgadinho, p_enrique, gitlost, SergeyBiryukov, markoheijnen, mikeschroder, ocean90, pento, helen, rodrigosevero, zodiac1978, ironprogrammer, audrasjb, azaozz, laboiteare, nuryko, virgar, dxd5001, onnimonni, johnbillion.
Fixes#24661, #47763, #35951.
See #30130, #52654.
git-svn-id: https://develop.svn.wordpress.org/trunk@53754 602fd350-edb4-49c9-b593-d223f7449a82