Greg Spencer 7775c23784
[Re-Land] Implement focus traversal for desktop platforms. (#31614)
This re-lands the Focus changes in #30040. Correctness changes in routes.dart, and removes the automatic requesting of focus on reparent when there is no current focus, which caused undesirable selections.

Addresses #11344, #1608, #13264, and #1678
Fixes #30084
Fixes #26704
2019-04-25 16:26:58 -07:00
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