Raph Levien 4760a9f190 Tailor grapheme boundaries so sequence emoji are one grapheme
Make it so it's not possible to position the cursor inside an emoji
formed by a sequence including zero-width joiners.

Bug: 25368653
Change-Id: I67ec0874cd1505f3c82ab91492ffc3d39a52fae6
2016-01-13 12:52:38 -08:00
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