Jason Simmons 573def2bee libtxt: improvements to glyph cluster handling and grapheme breaking (flutter/engine#4978)
* Extend Minikin to record the cluster identifier corresponding to each glyph
* Use the cluster values to determine the range of input code units that map
  to a glyph
* Use Minikin's libraries to find boundaries between graphemes within a
  ligature

Fixes https://github.com/flutter/flutter/issues/16151
2018-04-12 10:40:59 -07:00
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