Dan Field 98ad574d9b
Fix keepalive for large jumps on tabs and lists. (#21350)
* Ensure that the _childElements map is properly traversed as a sparse list and not inflated with garbage collected children.

* Add tests to ensure Lists/Tabs with KeepAlive children can make large jumps, don't lose children (including after rebuild).
2018-09-10 21:01:10 -04:00
..
2018-08-30 18:16:23 -07:00

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