Michael Goderbauer 7c34dfafc9
Adds a11y action for selecting text (and moving cursor) (#4589)
See https://github.com/flutter/flutter/pull/14275 for framework side change.

Also includes some minor clean-ups for consistency. 

Required for https://github.com/flutter/flutter/issues/13469.
2018-01-25 15:00:29 -08:00
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