stuartmorgan a461854026 Defer macOS arrow and backspace handling to framework (flutter/engine#22063)
The Flutter framework now has handling for arrow keys and backspace
in its editable text, so they no longer need to be handled in the
embedding. This not only avoids duplicate work, but improves the
handling of complex unicode (surrogate pairs, grapheme clusters) which
are currently correctly handled in the framework but not the macOS
embedding.

Fixes https://github.com/flutter/flutter/issues/68497
2020-10-26 12:56:30 -07:00
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