Michael Goderbauer fadcb3517c Tell Android which SemanticsNodes are focusable (flutter/engine#4067)
A node is considered focusable if it contains information that is interesing to the user. A node that doesn't add any semantic information of its own should not be focusable. It's expected that such a node has children, who have smeantics information and are therefore focusable.

Fixes https://github.com/flutter/flutter/issues/11179
2017-09-06 16:56:23 -07:00
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