Greg Spencer 05f4b33cd2
Add isFocusable to SemanticsFlag (#12618)
This adds an isFocusable to SemanticsFlag so that the framework can tell the engine what semantics nodes are allowed to be focused, which will affect what platform flags are applied to the semantics information.

This flag is not yet in use by the frame
2019-09-30 09:46:48 -07:00
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