Mark de Wever 857a78c04d [libc++] Implements Unicode grapheme clustering
This implements the Grapheme clustering as required by
P1868R2 width: clarifying units of width and precision in std::format

This was omitted in the initial patch, but the paper was marked as completed. This really completes the paper.

Reviewed By: ldionne, #libc

Differential Revision: https://reviews.llvm.org/D126971
2022-07-20 18:38:32 +02:00
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