Adlai Holler 1fbf8ad073 [ASDataController] Cancel if we lose our data source, fix bugs (#1987) ...

[ASRangeController] We're already on main thread, remove blocks

Make data source read-only, clarify what's asynchronous

[ASDataController] Clean up some interfaces

[ASDataController] A little more cleanup

[ASDataController] Cleanup

[ASDataController] Restore some changes, exit more often

[ASDataController] Use item counts that we already have rather than requerying them

[ASDataController] Revert weakifications

[ASDataController] Add a mechanism to measure how much work we avoided

2016-08-05 15:39:33 -07:00

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