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Allan Jardine 4913226456 Internal: Refactoring the sort functions for invalidation
- invalidation is going to play an important part in the new API, with
  the ability to invalid the cached data for sorting, filtering, display
  etc so we need to be able tos upport this in the core.

- In fairness the sorting didn't actually need invalidation because it
  would always get data on every sort, which is bad for performance -
  proper invalidation and caching will resolve this. Which is what has
  been implemented here.

- I had expected (hoped) to be able to save a bit of space in the
  refactor, but only aorund 100 bytes (compressed) saved, which will
  probably be lost when the invalidation is fully implemented in the
  API. Still, better performance, tidier code, and no extra space...

Fix: Sorting classes now show multi column sorting when a column is
defined to sort over multiple columns (sortData). Previously it would
only show the first column.
2013-05-16 17:16:04 +01:00
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