mapbox / mapbox-gl-native / 17661

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[core] Line-break ideographic text by character (#6828)

* [core] Line-break ideographic text by character

Allow a line break to be inserted after any supported Chinese, Japanese, or Yi character in a point-placed label. Balance the lines unless non-ideographic text such as Latin letters are present.

Fixes #1223.

* [core] Moved more character classing into util::i18n

* [core] Detect character properties by Unicode block

* [test] Reenabled ideographic breaking tests

62 of 62 new or added lines in 2 files covered. (100.0%)

10156 of 13126 relevant lines covered (77.37%)

17396.0 hits per line